Complex sentence: African bush elephants are the largest living terrestrial animals, being up to tall at the shoulders (a male shot in 1974); on average males are tall at the shoulders and in weight, while females are much smaller at tall and in weight.
Split into simpler sentences: African bush elephants are the largest living terrestrial animals, being up to tall at the shoulders (a male shot in 1974). On average, males are tall at the shoulders and in weight, while females are much smaller at tall and in weight.