Complex sentence: However, following a significant redescription of the fossils in 2004, a much smaller size has been suggested, based on the largest known skull, at long and wide, the whole animal was estimated at long, wide and tall at the hip.
Split into simpler sentences: However, following a significant redescription of the fossils in 2004, a much smaller size has been suggested, based on the largest known skull, which is long and wide. In this new description, the whole animal was estimated to be long, wide, and tall at the hip.