Complex sentence: Following the photon ray treatments, Mar-Vell was able to absorb solar energy to further increase his strength and after his encounter with eon he began to use his solar energy to fly, leaving a sparkling trail in his wake.
Split into simpler sentences: Following the photon ray treatments, Mar-Vell was able to absorb solar energy to further increase his strength. After his encounter with eon he began to use his solar energy to fly, leaving a sparkling trail in his wake.