Complex sentence: Graham, the only son of Sir Reginald Graham, 3rd Baronet, was at school at Eton College, served in the Grenadier Guards 1944--47 and then went with a scholarship to Trinity College, Cambridge 1948--50.
Split into simpler sentences: Graham, the only son of Sir Reginald Graham, 3rd Baronet, was at school at Eton College. He served in the Grenadier Guards from 1944--47 and then went with a scholarship to Trinity College, Cambridge 1948--50.