Complex sentence: With the discussion of Trinitarian doctrine now developed and well under agreement to orthodox and biblical understanding, it led to Christology, which would be the topic of the Council of Ephesus of 431 and the Council of Chalcedon of 451.
Split into simpler sentences: With the discussion of Trinitarian doctrine now developed and well under agreement to orthodox and Biblical understanding, it led to Christology. Christology would be the topic of the Council of Ephesus of 431 and the Council of Chalcedon of 451.