Complex sentence: The completed temple celebrated its first Maha Kumbabishekam (Consecration Ceremony) on 7 May 2017 and it marked the first day the new temple complex was opened to the public as a place of worship.
Split into simpler sentences: The completed temple will then celebrate its first Maha Kumbabishekam (Consecration Ceremony) on 7 May 2017. This will mark the first day the temple will be opened to the public as a place of worship.