Complex sentence: In 1963, Warner Bros began pressing the Reprise records as a favor to Frank Sinatra from friend Jack Warner-the reason the Reprise LP's state "A Product of Warner Bros" at the bottom of the label.
Split into simpler sentences: In 1963, Warner Bros began pressing the Reprise records as a favor to Frank Sinatra from friend Jack Warner. The reason the Reprise LP's state "A Product of Warner Bros" at the bottom of the label.