Complex sentence: It was first held on 29 December 2011, originating from a post on Reddit, and in 2012 domain registrar Namecheap began an initiative to make Move Your Domain Day an annual event.
Split into simpler sentences: It was first held on 29 December 2011, originating from a post on Reddit and spearheaded by domain registrar Namecheap. In 2012, Namecheap began an initiative to make Move Your Domain Day an annual event.