Complex sentence: The materials for this knife included 28 ounces of 18K gold, 153 emeralds totaling 10 karats and 9 diamonds totaling 5 karats, and a jade handle, it took 10 years to make and was sold for $2.1 million (US).
Split into simpler sentences: The materials for this knife included 28 ounces of 18K gold, 153 emeralds totaling 10 karats, 9 diamonds totaling 5 karats, and a jade handle. It took 10 years to make and was sold for $2.1 million (US).