Complex sentence: Potter's family moved to Farnham, Surrey, where he played principal roles with the Farnham Amateur Operatic Society, including Strephon in "Iolanthe" (1955) and Barinkay in "The Gypsy Baron" (1956).
Split into simpler sentences: Potter's family moved to Farnham, Surrey, where he became a leading member of the Farnham Amateur Operatic Society. Farnham audiences therefore saw him in his first principal roles in operatic productions, including Strephon in "Iolanthe" (1955), followed by Barinkay in "The Gypsy Baron" (1956).