Complex sentence: Michonne approaches the prison gates in a herd of walkers, somewhat disguised as a walker herself, carrying a basket of infant supplies; the herd soon senses her and she faints from exhaustion.
Split into simpler sentences: Michonne approaches the prison gates in a herd of walkers, as she is somewhat disguised as a walker herself and carries a basket of infant supplies. However, the herd soon senses her and she faints from exhaustion.