Complex sentence: On the other hand, Massachusetts Bay was the first colony to legalize slavery with provision 91 of the Massachusetts Body of Liberties, which developed protections for people who were unable to perform public service.
Split into simpler sentences: On the other hand, with provision 91 of the Body of Liberties, Massachusetts Bay was the first colony to legalize slavery. The Massachusetts Body of Liberties developed protections for people who were unable to perform public service.