Complex sentence: This mistrust unleashes a war that leaves the Masters defeated and Earth awash in the spores of a plant called the Flower of Life--the source of protoculture and a beacon to the mysterious Invid who scour the galaxy for its presence.
Split into simpler sentences: This mistrust unleashes a war that leaves the Masters defeated and Earth awash in the spores of a plant called the Flower of Life. The Flower of Life is the source of protoculture and acts as a beacon to the Invid who scrub the galaxy searching for its presence.