Complex sentence: It is thought that Monk originally composed it sometime between 1940 and 1941, however Harry Colomby claims that Monk may have written an early version around 1936 (at the age of 19) with the title "Grand Finale".
Split into simpler sentences: It is thought that Monk originally composed it sometime between 1940 and 1941. However, Harry Colomby claims that Monk may have written an early version around 1936 (at the age of 19) with the title "Grand Finale".