Complex sentence: Ol' 55 performed a retro-fifties style of music, some of their hits included remakes of Diana, Goodnight Sweetheart, Teenager In Love, Ruby, Two Faces Have I and Looking for an Echo.
Split into simpler sentences: Ol' 55 performed a retro-fifties style of music. Some of their hits included remakes of Diana, Goodnight Sweetheart, Teenager In Love, Ruby, Two Faces Have I and Looking For An Echo.