Complex sentence: Ephesus was previously a centre for worship of Artemis a virgin goddess; the Temple of Artemis there is regarded as one of the Seven Wonders of the Ancient World The cult of Mary was furthered by Queen Theodora in the 6th Century.
Split into simpler sentences: Ephesus was previously a centre for worship of Artemis a virgin goddess. The Temple of Artemis at Ephesus being regarded as one of the Seven Wonders of the Ancient World The cult of Mary was furthered by Queen Theodora in the 6th Century.