Complex sentence: Mainie Jellett studied at the Metropolitian School of Art in Dublin and under Walter Sickert at the Westminster Technical Institute in London where she showed precocious talent as an artist in the impressionist style.
Split into simpler sentences: Mainie Jellett studied at the Metropolitian School of Art in Dublin and under Walter Sickert at the Westminster Technical Institute in London. She showed precocious talent as an artist in the impressionist style.