Complex sentence: What a Diff'rence a Day Made "is a popular song originally written in Spanish by María Grever, a Mexican songwriter, in 1934 with the title," "Cuando vuelva a tu lado" ("When I Return to Your Side").
Split into simpler sentences: What a Diff'rence a Day Made is a popular song originally written in Spanish by María Grever, a Mexican songwriter, in 1934. Originally, the song was known as "Cuando vuelva a tu lado"("When I Return to Your Side").