Original: After composing a second string quartet (1946), his strongest achievement in the world of chamber music, Walton dedicated the considerable period of seven years to his three-act tragic opera, Troilus and Cressida (1947-1954).
Simplified: After composing a second string quartet (1946) Walton spent most of the next seven years writing his opera, Troilus and Cressida (1947-1954).