Complex sentence: Though quite effective, Orochimaru neglected to tell Mizuki that the potion was so far incomplete, drinking it burned up all the energy in Mizuki's cells, leaving him a withered husk of a person.
Split into simpler sentences: Though quite effective, Orochimaru neglected to tell Mizuki that the potion was incomplete. Drinking it burned up all the energy in Mizuki's cells, leaving him a withered husk of a person.