Which is the best way to combine sentences 1 and 2? Olaudah Equiano wrote a book, which was about his experiences as a slave and
, later, as a free man. Olaudah Equiano wrote a book, even if it was about his experiences as a slave and, later, as a free man. Olaudah Equiano wrote a book, until it was about his experiences as a slave and, later, as a free man. Olaudah Equiano wrote a book, although it was about his experiences as a slave and, later, as a free man.
Sub-questions are narrower questions. They are important because they provide the 'skeleton' around which you will find information to answer your main research question.
