Complex sentence: They also put sugar and water together in Meredith's mosquito repellant bottle, and then they take her floatable mattress out the tent and put it in the lake, who becomes enraged and gives Nick an ultimatum that he choose her or the girls.
Split into simpler sentences: They also put sugar and water together in Meredith's mosquito repellant bottle, and then they take her floatable mattress out the tent and put it in the lake. Meredith becomes enraged and gives Nick an ultimatum that he choose her or the girls.