Simplify the following text for a Grade 15 native English-speaking person.
Original: Marcel Theo Hall ( born April 8 , 1964 , Savage , Maryland ) better known by his stage name Biz Markie , is an American rapper , DJ , comedian , actor , reality television personality and commercial spokesperson , best known for the single `` Just a Friend '' , an American Top 10 hit in 1989 .
Simplified: Marcel Theo Hall ( born April 8 , 1965 in Savage , Maryland ) is an American rapper , beatboxer , DJ , record producer , comedian , actor and reality television personality who is better known by his stage name , Biz Markie .