Complex sentence: St. Conleth's College is a fee-paying Catholic school in Dublin, Ireland, founded in 1939, by Bernard Sheppard who ran the school from 16 Clyde Road until due to demand the school was upgraded to the larger premises at 28 Clyde Road.
Split into simpler sentences: St. Conleth's College is a fee-paying Catholic school in Dublin, Ireland, founded in 1939, by Bernard Sheppard. Who ran the school from 16 Clyde Road until due to demand the school was upgraded to the larger premises at 28 Clyde Road.