Complex sentence: Influenced by Expressionism, he at first painted in the manner of Romantic realism, and from the 1960s onward, a sizable number of his canvases began to span a visual continuum from semi-abstract pieces to Abstract expressionism.
Split into simpler sentences: Influenced by Expressionism, he at first painted in the manner of Romantic realism. From the 1960s onward, a sizable number of his canvases began to span a visual continuum from semi-abstract pieces to Abstract expressionism.