Complex sentence: The meteorite weighs 30 pounds (12 Kg), measures one-foot in diameter, and has a composition of 80% mineral and 20% metal (a mixture of nickel and iron).
Split into simpler sentences: The meteorite weighs 30 pounds (12 Kg), and measures one-foot in diameter. The composition of the meteorite is 80% mineral and 20% metal (a mixture of nickel and iron).