Complex sentence: One of the first videos under the "Angry Grandpa" moniker was one posted in 2007, entitled "Grandpa Ruins Christmas", posted on Break.com, by Michael in which Green rages at his family on Christmas morning for prematurely opening gifts without waiting for him.
Split into simpler sentences: One of the first videos under the "Angry Grandpa" moniker was one posted on Break.com around Christmas 2007, entitled "Grandpa Ruins Christmas". The video shows Green raging at his family on Christmas morning for prematurely opening gifts without waiting for him.