Complex sentence: Gareth begs for mercy, but Rick reminds him of his earlier promise to kill him with a red handled machete, as he Michonne, Sasha and Abraham slaughter Gareth, Martin and the rest of the Hunters as Glenn, Maggie, Tara and Tyreese watch disturbed.
Split into simpler sentences: Gareth begs for mercy, but Rick reminds him of his earlier promise to kill him with a red handled machete. Rick, Michonne, Sasha, and Abraham slaughter Gareth, Martin, and the rest of the Hunters as Glenn, Maggie, Tara, and Tyreese watch disturbed.