Array Field for a Content Type. Is it possible? I'm new in drupal and I'm about to use drupal for my expanding site.
This is my issue:
I have some documents which segmented to sentences and words and each word has a tag for example:

Document: 
   This is a test text to show what I say. This is the second sentence. This is the third.
Sentences: 
   1. This is a test text to show what I say
   2. This is the second sentence
and so on.

Tagged words: 
   This => ABC
   is => DEF
   a => EE
   test => NME
and so on.

I would like to make a node for each document not each word or sentence and store sentences and words as fields.
This data is stored in a mysql database and I can export it in any form.
How can I implement this structure in Drupal?
Is there any module for it? or I should develop a new module?
or any other solution?

Thank you all so much
In case you want to store complete array as a single input in a field, you can do so by serialize the array.

Create a long text field and serialize the array before input by calling hook_node_submit().