Complex sentence: Both Voskovec and Werich fled to the United States in early 1939; from then on, Voskovec lived primarily in the United States, only living in Czechoslovakia in 1948 and in France from 1948 to 1950.
Split into simpler sentences: Both Voskovec and Werich fled to the United States in early 1939. For the rest of his life, Voskovec lived primarily in the United States, interupted only by brief stays in Czechoslovakia in 1948 and in France from 1948 to 1950.