Complex sentence: Mike soon realizes that Scarlett is the "best decision" he had ever made and finally realizes that his own selfishness has driven his family away tries to re-unite with her and unsuccessfully explains to her that he is actually Mike, her husband.
Split into simpler sentences: Mike soon realizes that Scarlett is the "best decision" he had ever made and finally realizes that his own selfishness has driven his family away. He tries to re-unite with her and unsuccessfully explains to her that he is actually Mike, her husband.