Complex sentence: The lava making up the flow came from Little Black Peak, about 10 miles north-northwest of Carrizozo, and went about 40 miles south-southwest down the bottom of Tularosa Basin in two active flows.
Split into simpler sentences: The lava making up the flow came from Little Black Peak, about 10 miles north-northwest of Carrizozo. It reached about 40 miles south-southwest along the bottom of Tularosa Basin in two active flows.