After the lava cooled, magma pushed the center of the caldera upward forming a mass of igneous rock.
(the lava; cooled; ) (magma; pushed; the center of the caldera; T:After the lava cooled) (the caldera; upward forming; a mass of igneous rock)
the lava magma the caldera
cooled pushed upward forming
the center of the caldera T:After the lava cooled
a mass of igneous rock