Complex sentence: From there she moved to London where she was a member of the avant-garde London Group, from 1937-39 she lived in New York after which, she returned to Ireland, settled in Dublin and concentrated on painting.
Split into simpler sentences: From there she moved to London where she was a member of the avant-garde London Group, from 1937-39 she lived in New York. After New York, she returned to Ireland, settled in Dublin and concentrated on painting.