Complex sentence: He correctly identified chicken as the most common bird in the world, and received a 100 point bonus for correctly recognising calcium as the most common metal in the human body, ending the program with 88 points.
Split into simpler sentences: He correctly identified chicken as the most common bird in the world, and received a 100 point bonus. He also received extra points for correctly recognising calcium as the most common metal in the human body, ending the program with 88 points.