Complex sentence: Ross Nichols (1902-1975), a Cambridge academic and published poet, artist and historian, who founded the Order of Bards, Ovates and Druids in 1964, and since then, he wrote prolifically on the subjects of Druidism and Celtic mythology.
Split into simpler sentences: Ross Nichols (1902-1975), was a Cambridge academic and published poet, artist and historian, who founded the Order of Bards, Ovates and Druids in 1964. He wrote prolifically on the subjects of Druidism and Celtic mythology.