Simplify the following text for a Grade 11 native English-speaking person.
Original: During his fifth year as Vice President , in the late summer of 1973 , Agnew was under investigation by the United States Attorney 's office in Baltimore , Maryland , on charges of extortion , tax fraud , bribery and conspiracy .
Simplified: He is most famous for his resignation in the fall of 1973 after he was under investigation for the crime of extortion , tax fraud , bribery , and conspiracy .