Complex sentence: During the leadup to System 7, Apple studied the online help system in depth, and identified two main types of questions users asked in the computer context; "what is this thing?" and "how do I accomplish...?".
Split into simpler sentences: During the leadup to System 7, Apple studied the problem of getting help in depth. In the context of computer use they identified two main types of questions users asked; "what is this thing?" and "how do I accomplish...?".