Complex sentence: His usual customers include Isabelle Adjani, Princess Caroline of Monaco, Alain Ducasse, François Pinault, Robert Agostinelli, Valentino, and, he provided the decoration of Paloma Picasso's jewelry shop, of the Mark Hotel on Madison Avenue, and of the Barbizon Hotel.
Split into simpler sentences: His usual customers include Isabelle Adjani, Caroline of Monaco, Alain Ducasse or François Pinault. In New York, he provided the decoration of Paloma Picasso's jewelry shop, of the Mark Hotel on Madison Avenue, and of the Barbizon Hotel.