Simplify the following text for a Grade 11 native English-speaking person.
Original: Hodgkin 's lymphoma , previously known as Hodgkin 's disease , is a type of lymphoma , which is a cancer originating from white blood cells called lymphocytes .
Simplified: Hodgkin 's lymphoma , also known as Hodgkin 's disease , is a cancer of the lymphatic system , also known as a lymphoma .