Simplify the following text for a Grade 4 native English-speaking person.
Original: Zak Starkey ( born 13 September 1965 ) is the son of Beatles drummer Ringo Starr .
Simplified: Zak Starkey ( born 13 September 1965 ) is an English rock drummer . He is the son of Beatles drummer Ringo Starr and Starr 's first wife Maureen Cox .