Complex sentence: These bishops never interfered in the internal affairs of church which was managed by the leader of St Thomas christian community until their encounter with the Portuguese in 1599.There after Christians of St Thomas have been influenced by many belief streams at different points of time.
Split into simpler sentences: These bishops never interfered in the internal affairs of church, Church of St Thomas christians was managed by its own leader. However situation changed after their encounter with the Portuguese in 1599.There after Christians of St Thomas have been influenced by many belief streams at different points of time.