Complex sentence: The winner of the survival challenge receives the cake-topper (a mock-up model of the couple), the couples than goto Couple's Chapel where each couple receives one vote and the couple with the most votes is eliminated.
Split into simpler sentences: The winner of the survival challenge receives a cake-topper (a mock-up model of the couple). The couples then go to Couple's Chapel, a ceremony where couples vote off other couples, and the couple with the most votes is eliminated.