Complex sentence: As he had played in the loss of the 2012 grand final, was injured through the 2013 grand final and was not selected in the 2014 Grand final, this was a special moment for him as his first grand final win.
Split into simpler sentences: As he had played in the loss of the 2012 grand final, was injured and could not play in the 2013 grand final, and was not selected in the 2014 Grand final. This was a special moment for him as his first grand final win.