Simplify the following text for a Grade 13 native English-speaking person.
Original: A would-be universal conqueror , the Master wants to control the universe ( in The Deadly Assassin his ambitions were described as becoming `` the master of all matter '' , and in `` The Sound of Drums '' he acknowledges that he chose the name `` the Master '' ) , with a secondary objective of eliminating and\/or hurting the Doctor .
Simplified: A would-be universal conqueror , the Master wants to control the universe ( in The Deadly Assassin his ambitions were becoming `` the master of all matter '' , and in `` The Sound of Drums '' he acknowledges that he chose his own name ) .