Complex sentence: He raises his sword over his head and brings it down, appearing to cut Tira in half, but there is a light shining from her body and as he strikes the ground with is sword two shockwaves of icicles sprout from the ground.
Split into simpler sentences: He raises his sword over his head and brings it down, appearing to cut Tira in half, but there is a light shining from her body. As he strikes the ground with his sword, two shockwaves of icicles sprout from the ground.