Simplify the following text for a Grade 12 native English-speaking person.
Original: He was aided by the support of the Bavarian People 's Party ( BVP ) , which switched its support from Marx , and the refusal of the Communist Party of Germany ( KPD ) to withdraw its candidate , Ernst ThÃ lmann .
Simplified: He was helped when the Bavarian People 's Party ( BVP ) , switched its support from Marx , the SPD candidate and the Communist Party of Germany ( KPD ) to did not withdraw its candidate , Ernst ThÃ lmann .