Complex sentence: The Janitor and the rest of the Hospital support staff ask Dr. Kelso for a dental plan with their salaries but when he refuses they get employment in the coffee shop which includes a dental plan, and refuse to offer service to Dr. Kelso.
Split into simpler sentences: The Janitor and the rest of the Hospital support staff ask Dr. Kelso for a dental plan with their salaries. When he refuses they get employment in the coffee shop which includes a dental plan, and refuse to offer service to Dr. Kelso.