Complex sentence: They realize that there can be no answer to Marvin's question--but the question remains; however, when Whizzer asks if Marvin regrets their relationship, Marvin doesn't hesitate to say that he'd do it all over again.
Split into simpler sentences: They realize that there can be no answer to Marvin's question--but the question remains. When Whizzer asks if Marvin regrets their relationship, Marvin doesn't hesitate to say that he'd do it all over again.