Complex sentence: She was signed as a model for Ford Models at age fifteen, and spent her summers modeling in New York City, where she moved in 1972 and worked at her brother's theater group, as well as studied with actor William Hickey.
Split into simpler sentences: She was signed as a model for Ford Models at age fifteen, and spent her summers modeling in New York City. She moved there in 1972, and worked at her brother's theater group, as well as studied with actor William Hickey.