Simplify the following text for a Grade 11 native English-speaking person.
Original: A VIPoma ( also known as Verner Morrison syndrome , after the physicians who first described it ) is a rare ( 1 per 10,000,000 per year ) endocrine tumor , usually ( about 90 % ) originating in the pancreas , that produces vasoactive intestinal peptide ( VIP ) .
Simplified: A VIPoma ( Pronounced `` V I P oma '' ) ( also called Verner Morrison syndrome after the doctors who first noticed it ) , is a tumor that does not happen a lot ( 1 per 10,000,000 per year ) in the pancreas . VIPoma makes something called vasoactive intestinal peptide , or VIP .