Complex sentence: It is therefore possible for leiomyosarcomas to appear at any site in the body (including the breasts); they are most commonly found in the uterus, stomach, small intestine and retroperitoneum.
Split into simpler sentences: It is therefore possible for leiomyosarcomas to appear at any site in the body. They are most commonly found in the uterus, stomach, small intestine and retroperitoneum.