Complex sentence: It is also in communion with the Malabar Independent Syrian Church (also known as Independent Syrian Church of Thozhiyoor), the Syro-Malabar Catholic Church and the Jacobite Syrian Christian Church; but these churches have not accepted each other's doctrines in its fullness.
Split into simpler sentences: It is also in communion with the Malabar Independent Syrian Church (also known as Independent Syrian Church of Thozhiyoor). It maintains friendly relation with Syro-Malabar Catholic Church and the Jacobite Syrian Christian Church; but these churches have not accepted each other's doctrines in its fullness.