Complex sentence: Antoine de Beaulieu (died 1663) was a French noble, dancer, and ballet master of the Swedish court from 1637 to 1663 and is considered to have introduced ballet in Sweden.
Split into simpler sentences: Antoine de Beaulieu (died 1663), was a French noble, dancer and ballet master. He was the ballet master of the Swedish royal court from 1637 to 1663 and are considered to have introduced Ballet in Sweden.