Complex sentence: He did not record for most of the 1930s, affected by ill health; he recorded only two sessions (January 21,1938, and June 5,1940), both for Decca.
Split into simpler sentences: He did not record for most of the 1930s, affected by ill health. He recorded only two sessions (January 21,1938, and June 5,1940), both for Decca.