Complex sentence: Like all sauropods, "Nigersaurus" was a megafaunal quadruped with a small head, thick hind legs, and a prominent tail "Nigersaurus" was a fairly genera, with a body length of only and a femur reaching only.
Split into simpler sentences: Like all sauropods, "Nigersaurus" was a megafaunal quadruped with a small head, thick hind legs, and a prominent tail. Among that clade, "Nigersaurus" was fairly small, with a body length of only and a femur reaching only.