Complex sentence: The latter assemblage includes 22 skeletons, with 15 individuals representing a herd of females and juveniles that died in a single event, probably a flash flood; the arrangement of some of the skeletons suggests that the females may have formed a defensive ring around the juveniles.
Split into simpler sentences: The latter assemblage includes 22 skeletons, with 15 individuals representing a herd of females and juveniles that died in a single event. It was originally proposed that the herd was killed by a flash flood, and that the arrangement of some of the skeletons suggests that the females may have formed a defensive ring around the juveniles.