Complex sentence: "Yesterday" is one of the most recorded songs in the history of popular music; its entry in "Guinness World Records" states that, by January 1986,1,600 cover versions had been made.
Split into simpler sentences: Yesterday is one of the most recorded songs in the history of popular music. Its entry in "Guinness World Records" states that, by January 1986,1,600 cover versions had been made.