Complex sentence: That event is said to have seen them harassed by anti-Catholic forces, causing them to flee to Venice where Cajetan met Saint Jerome Emiliani, whom he assisted in the establishment of his Congregation of Clerks Regular.
Split into simpler sentences: That event is said to have seen them harassed by anti-Catholic forces, causing them to flee to Venice where he met Saint Jerome Emiliani. He assisted St Jerome in the establishment of his Congregation of Clerks Regular.