Complex sentence: "Too-Ra-Loo-Ra-Loo Ral" was popular when Olcott initially released it, but in 1944, Crosby released a version of the song which became even more successful than the original.
Split into simpler sentences: Too-Ra-Loo-Ra-Loo Ral was popular when Olcott initially released it. In 1944, Crosby released a version of the song which became even more successful than the original.