Complex sentence: Despite Grandpa's warning, the guard stays, and the mummy quickly grabs him and uses the corrodium to mutate him into an impromptu minion, complete with razor sharp arms and a disfigured face, all in black with purple outlines.
Split into simpler sentences: Despite Grandpa's warning, the guard stays, and the mummy quickly grabs him, using the corrodium to mutate him into an impromptu minion. The guard is now a monster, complete with razor sharp arms and a disfigured face, all in black with purple outlines.