Complex sentence: Under his son, Edward VI, the Church of England became more influenced by the European Protestant movement but once again came under papal authority during the reign of Queen Mary I in 1555 but this reunion was short-lived.
Split into simpler sentences: Under his son, Edward VI, the Church of England became more influenced by the European Protestant movement. It rejoined the Catholic Church during the reign of Queen Mary I in 1555 but the reunion was short-lived.