Complex sentence: Robert Mandell (born August 22,1929) is an international American conductor noted in the United Kingdom for his popular Family Concerts, Young People's Concerts and as both a director and conductor of stage musicals.
Split into simpler sentences: Robert Mandell (born August 22,1929) is an international conductor. While American, he is noted in the United Kingdom for his popular family concerts, young people's concerts, and stage musicals.