Complex sentence: During the 1970's Semm pioneered numerous gynecologic laparoscopic operations so that the end of the decade he had performed myomectomies, ovariectomies, ovarian cysts resections, removals of ubal pregnancy, and others.
Split into simpler sentences: During the 1970's Semm pioneered numerous gynecologic laparoscopic operations. By the end of the 1970's he had performed myomectomies, ovariectomies, ovarian cysts resections, removals of ubal pregnancy, and others.