Complex sentence: His initial appearance was in a production of "The Marvellous History of St Bernard" in which he appeared as Seigneur de Miolans in a play adapted from a 15th century manuscript by Henri Ghéon.
Split into simpler sentences: His initial appearance was in a production of "The Marvellous History of St Bernard" in which he appeared as Seigneur de Miolans. The play was adapted from a 15th century manuscript by Henri Ghéon.