Complex sentence: Drawing upon an ancient legacy, Leo relentlessly assaulted Desghidorah, eventually renewing the seal that bound the world destroyer beneath the soil of the earth; but his work was not done with the end of the fight.
Split into simpler sentences: Drawing upon an ancient legacy, Leo relentlessly assaulted Desghidorah, eventually renewing the seal that bound the world destroyer beneath the soil of the earth. But his work was not done with the end of the fight.