Complex sentence: After handing the bag of powder to Harmon, Christian grabbed the referee's shirt and Frieman turned around to cover Harmon, except Harmon was waiting on his feet, with the powder and threw entire contents of the bag into Frieman's face.
Split into simpler sentences: After handing the bag of powder to Harmon, Christian grabbed the referee's shirt and Frieman turned around to cover Harmon. However, to Frieman's surprise, Harmon was waiting on his feet, with the powder and threw entire contents of the bag into Frieman's face.