Complex sentence: It was acclaimed upon release as the greatest musical biography to be made in Hollywood and still remains a standard in musical film making, and at just short of three hours, "The Great Ziegfeld" was also the longest film of the time.
Split into simpler sentences: It was acclaimed upon release as the greatest musical biography to be made in Hollywood and still remains a standard in musical film making. At just short of three hours, "The Great Ziegfeld" was also the longest film of the time.