Original sentence: Grylls made his name with his claim to have become, at the age of 23, the youngest Briton to climb Mount Everest and return alive in 1998- it was later revealed a younger British man may have completed this feat before him
Edited sentence: Grylls made his name with his claim to have become, at the age of 23, the youngest Briton to climb Mount Everest and return alive in 1998- a younger British man was later revealed to have completed this feat before him