Original sentence: "  During his time with Balanchine, in his early 20's, he also was a guest choreographer with co's ranging from the San Francisco Ballet, to the Royal Winnipeg Ballet, to the Deutsche Oper Ballet in Berlin.Before that time,Clifford was a principal dancer and choreographer with George Balanchine’s New York City Ballet, (1966–1974) and guest artist from 1974–1980, and was widely considered to be Balanchine’s protégé (Saturday Review).Trained in Los Angeles by the teachers Carmelita Maracci, Katherine Etienne, George Zoritch, Natalia Claire, David Lichine, Eugene Loring, Maria Bekefi, Irina Kosmovska, and Eleanor Powell's Tap teacher, Willie Covan, his first ballet appearance was at the age of eleven as the “Nutcracker Prince” in Balanchine’s New York City Ballet production of “The Nutcracker” at the Los Angeles Greek Theater
Edited sentence: "  During his time with Balanchine, in his early 20's, he also was a popular guest choreographer with co's ranging from the San Francisco Ballet, to the Royal Winnipeg Ballet, to the Deutsche Oper Ballet in Berlin.Before that time, however, Clifford was a world-renowned principal dancer and choreographer with George Balanchine’s New York City Ballet, (1966–1974) and guest artist from 1974–1980, and was widely considered to be Balanchine’s protégé (Saturday Review).Trained in Los Angeles by the legendary teachers Carmelita Maracci, Katherine Etienne, George Zoritch, Natalia Claire, David Lichine, Eugene Loring, Maria Bekefi, Irina Kosmovska, and Eleanor Powell's Tap teacher, Willie Covan, his first ballet appearance was at the age of eleven as the “Nutcracker Prince” in Balanchine’s New York City Ballet production of “The Nutcracker” at the Los Angeles Greek Theater