Simplify the following text for a Grade 8 native English-speaking person.
Original: He stated that the excision should be radical and that all diseased tissue should be removed , which included the use of amputation or the removal of veins running in the direction of the tumor .
Simplified: He stated that the removal should be radical and that all diseased tissue should be removed . This included the use of amputation or the removal of veins running in the direction of the tumor .