Complex sentence: Marisha Ray is engaged to Matthew Mercer, a fellow voice actor and a fellow member of the Critical Role cast (the Dungeon Master), and are due to be married in October 2017.
Split into simpler sentences: Marisha Ray is engaged to Matthew Mercer, a fellow voice actor and a fellow member of the Critical Role cast (the Dungeon Master). The two are due to be married in October 2017.