Complex sentence: In 1960 William Acquavella joined his father and the focus of the gallery expanded to major works of the 19th and 20th centuries, including masters of Impressionism, Post-Impressionism, Surrealism and Cubism.
Split into simpler sentences: In 1960 William Acquavella joined his father and the focus of the gallery expanded to major works of the 19th and 20th centuries. These included masters of Impressionism, Post-Impressionism, Surrealism and Cubism.