Original: At the age of ten , Walton was accepted as a chorister at Christ Church Cathedral in Oxford , and he subsequently entered Christ Church of the University of Oxford as an undergraduate at the unusually early age of sixteenKennedy , p. 6/7 .
Simplified: At the age of ten he joined the choir of Christ Church Cathedral in Oxford . He was only 16 years when he went to University of Oxford where he was at Christ Church , Oxford .