Complex sentence: David and Dorian both mutually agree to balance their marriage with their own busy careers, with David going to Sweden to film his movie for three months, while coming back to Washington D.C. on Election Night to be there to support Dorian to win the senatoral election.
Split into simpler sentences: David and Dorian mutually agree to balance their marriage with their own busy careers. David goes to Sweden to film his film for three months and comes back to Washington, D.C., on Election Night to be there to support Dorian to win the senatoral election.