In fact the evidence was not strong enough to persuade Jacques Cassini who never conceded defeat but it did convince CsarFranois Cassini who made the difficult decision to change sides in the arguments and oppose his familys long held view

Please fix the punctuation.
In fact the evidence was not strong enough to persuade Jacques Cassini , who never conceded defeat, but it did convince Cesar-Francois Cassini who made the difficult decision to change sides in the arguments and oppose his family's long held view.