Complex sentence: Soon after Piccolo had surgery at Sloan-Kettering in New York City to remove the tumor, he had another surgery in April 1970 to remove his left lung and pectoral muscle.
Split into simpler sentences: Soon after Piccolo had surgery at Sloan-Kettering in New York City to remove the tumor. He had another surgery in April 1970 to remove his left lung and pectoral muscle.