Complex sentence: Many top performers, such as Liberace, George Burns, Pat Cooper, and Phyllis Diller performed at the hotel, but this practice did not continue, as the Landmark was not a high profit venture.
Split into simpler sentences: Many top performers, such as Liberace, George Burns, Pat Cooper, and Phyllis Diller have performed at the hotel. Having top performers at the Landmark did not continue, as the Landmark was not a high profit venture.