Complex sentence: These discoveries date backs to the establishment of a church here by St.Thomas back in 54 AD and was considered as one among the Seven and a half churches ("Ezharappallikal") in Kerala.
Split into simpler sentences: These discoveries date backs to the establishment of a church there by St.Thomas back in 54 AD. It is considered as one among the Seven and a half churches ("Ezharappallikal") in Kerala.