Complex sentence: Goalkeepers appear to have longer playing careers than outfield players, many not retiring until their late thirties or early forties, an example of this being Peter Shilton who played for 31 years between 1966 and 1997, retiring at the age of 47.
Split into simpler sentences: Goalkeepers appear to have longer playing careers than outfield players, many not retiring until their late thirties or early forties. For example, Peter Shilton played for 31 years between 1966 and 1997 before retiring at the age of 47.