Complex sentence: Harold is accosted by the Fairy Godmother and Charming, her son by reprimanding Harold for violating a promise that Charming would be able to marry Fiona, and request that he find a manner to get rid of Shrek.
Split into simpler sentences: Harold is accosted by the Fairy Godmother and Charming, her son. They reprimand Harold for breaking an old promise that Charming would be able to marry Fiona, and demand that he find a way to get rid of Shrek.