Complex sentence: In their second attempt, Marcie tries cooking four eggs on a waffle iron, then she unsuccessfully tries to put one in a toaster, then she takes that egg and the others and tries roasting the remaining eight eggs in the oven.
Split into simpler sentences: In their second attempt, Marcie tries cooking four eggs on a waffle iron, then she unsuccessfully tries to put one in a toaster. Then she takes that egg and the others and tries roasting the remaining eight eggs in the oven.