Original: It is also the biggest wild sheep, standing as high as 120 c and weighing as much as 180 k/O. The Pamir argali (also called Marco Polo sheep, for they were first described by that traveller) may attain more than 6 f in length.
Simplified: The Pamir argali (also called Marco Polo sheep, for they were first described by that traveller) may be more than 6 feet in length.