Complex sentence: John went to the Bury Grammar Junior School in 1919, and to the Senior school in 1922.He disliked Greek and his professors allowed him to study Chemist and Physics instead, demonstrating big ability in the scientific field.
Split into simpler sentences: John went to the Bury Grammar Junior School in 1919, moving on to the Senior school in 1922. He had a scientific aptitude and disliked Greek so his professors allowed him to study Chemist and Physics instead, demonstrating big ability in the scientific field.