Complex sentence: They must complete their mission or their target's baby will not be born, and they are not allowed to leave Earth until they complete their mission.The girls try to finish their missions by the book, but something always gets in the way.
Split into simpler sentences: They must complete their mission or their target's baby will not be born. They are not allowed to leave Earth until they complete their mission.The girls try to finish their missions by the book, but something always gets in the way.