Complex sentence: Dry Bones are the skeletal remains of Koopa Troopas that have been re-animated; according to's Tattle in, Dry Bones are former Koopas whose spirit animates its bones.
Split into simpler sentences: Dry Bones are the skeletal remains of Koopa Troopas that have been re-animated. According to's Tattle in, Dry Bones are former Koopas whose spirit animates its bones.