Complex sentence: Ayla city (modern day Aqaba) in southern Jordan, also came under Byzantine Empire rule, where the Aqaba Church was built around 300 AD, considered to be the world's first purpose built Christian church.
Split into simpler sentences: Ayla city (modern day Aqaba) in southern Jordan also came under Byzantine Empire rule. The Aqaba Church was built around 300 AD, and is considered the world's first purpose built Christian church.