Complex sentence: After playing the violin and recording with many jazz and dance bands, and leading his own London Casino Orchestra, in the 1920s and 1930s, during World War II, Rignold began to conduct classical orchestras.
Split into simpler sentences: After playing the violin and recording with many jazz and dance bands, and leading his own London Casino Orchestra, in the 1920s and 1930s. During World War II, Rignold began to conduct classical orchestras.