In this task, you are given a list. This list contains many lists of integers. The list is several items written within a []. Your task is to find the maximum number among the members of each inner list. The output should be a list comprised of the maximums with the same order as the internal lists.
[[-120, 75, -63, 24, -12, 90], [-53, -92, -144, 47, 13, -42]]