Modify the given paragraph to be less complicated
The most complete specimen measures up to 12.3 m in length though " T. rex " could grow to lengths of over 12.3 m, up to 3.66 m tall at the hips, and according to most modern estimates 8.4 MT to 14 MT in weight.
It was up to 12.3 m in length, up to 4 m tall at the hips, and up to 6.8 MT in weight.