The best way to combine sentences 1 and 2 is by saying, 'Olaudah Equiano wrote a book, which was about his experiences as a slave and, later, as a free man.'
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.
Example: Olaudah Equiano wrote a compelling book, which detailed his harrowing journey from slavery to freedom.
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