10. A non-transitory computer-readable storage medium that stores instructions which, when executed by one or more processors, cause the one or more processors to perform steps for generating shorter versions of one or more sentences comprising: receiving, by a computing device, the one or more sentences from a text; based on the one or more sentences, generating, by the computing device within a memory of the computing device, a tree comprising a plurality of nodes; wherein the tree represents representing the one or more sentences; wherein each node, of the plurality of nodes, represents a grammatical element of the one or more sentences; using a named entity recognizer, automatically recognizing which nodes, of the plurality of nodes, represent grammatical elements that correspond to recognized named entities; selecting a particular node from the tree based, at least in part, on (a) which nodes in the tree correspond to recognized named entities, (b) a position of the particular node within the tree, and (c) a node type of the particular node; wherein the particular node has no children within the tree that correspond to recognized named entities identified by the named entity recognizer; after said selecting, modifying the tree within the memory of the computing device by removing the particular node and children of the particular node from the tree; after removing, from the tree, the particular node and the children of the particular node, generating, from remaining nodes of the tree, a first set of one or more sub-sentences; wherein the first set of one or more sub-sentences are shorter in length than said one or more sentences; causing display of at least one sub-sentence generated from remaining nodes of the tree to a user.
10. A non-transitory computer-readable storage medium that stores instructions which, when executed by one or more processors, cause the one or more processors to perform steps for generating shorter versions of one or more sentences comprising: receiving, by a computing device, the one or more sentences from a text; based on the one or more sentences, generating, by the computing device within a memory of the computing device, a tree comprising a plurality of nodes; wherein the tree represents representing the one or more sentences; wherein each node, of the plurality of nodes, represents a grammatical element of the one or more sentences; using a named entity recognizer, automatically recognizing which nodes, of the plurality of nodes, represent grammatical elements that correspond to recognized named entities; selecting a particular node from the tree based, at least in part, on (a) which nodes in the tree correspond to recognized named entities, (b) a position of the particular node within the tree, and (c) a node type of the particular node; wherein the particular node has no children within the tree that correspond to recognized named entities identified by the named entity recognizer; after said selecting, modifying the tree within the memory of the computing device by removing the particular node and children of the particular node from the tree; after removing, from the tree, the particular node and the children of the particular node, generating, from remaining nodes of the tree, a first set of one or more sub-sentences; wherein the first set of one or more sub-sentences are shorter in length than said one or more sentences; causing display of at least one sub-sentence generated from remaining nodes of the tree to a user. 17. The non-transitory computer-readable medium of claim 10 , further comprising instructions for performing: before said generating the tree: determining, based on a filter that identifies words that are not directly related to a story of the one or more sentences, a set of one or more words to remove from the one or more sentences; removing the set of one or more words from the one or more sentences.