Complex sentence: It was the era when Twiggy, the top fashion model was introduced to the fashion scene by David Bailey, a leading photographer brought the "pale, gauche and young" look a rage which is copied even today.
Split into simpler sentences: It was the era when Twiggy, the top fashion model was introduced to the fashion scene by David Bailey, a leading photographer. She made the "pale, gauche and young" look a rage which is copied even today.