Complex sentence: As he lies dying at the bottom of the stairs, Glendon, still in werewolf form, speaks, first to thanks Col. Forsythe for the merciful bullet, then saying goodbye to Lisa, apologizing for not being a good husband to her.
Split into simpler sentences: As he lies dying at the bottom of the stairs, Glendon, still in werewolf form, speaks, first to thanks Col. Forsythe for the merciful bullet. He then says goodbye to Lisa, apologizing for not being a good husband to her.