Complex sentence: When that failed, she cost him the match by pushing over the ladder he was on as he was about to win and then she held down Eddie on the ground afterwards so he couldn't get up and and attack Mysterio.
Split into simpler sentences: When that failed, she cost him the match by pushing over the ladder he was on as he was about to win. After that she held down Eddie on the ground afterwards so he couldn't get up and and attack Mysterio.