Complex sentence: St Winifred's School for girls was founded on May 3rd 1887; named after the Welsh 7th Century Saint Winefride; its driving force and primary sponsor was the Honorable Eleanor Douglas Pennant, one of the daughters of Lord Penrhyn.
Split into simpler sentences: St Winifred's School for girls was founded on 3 May 1887 and named after the Welsh 7th-century Saint Winefride. Its driving force and primary sponsor was the Honorable Eleanor Douglas Pennant, one of the daughters of Lord Penrhyn.