Complex sentence: The screenplay for "Galileo" written by Barbara Bray and Losey relies primarily on the "American" version of Brecht's play that was first performed in 1947.
Split into simpler sentences: The screenplay for "Galileo" was written by Barbara Bray and Losey. Their screenplay for "Galileo" relies primarily on the "American" version of Brecht's play that was first performed in 1947.