Complex sentence: Hailing from the 22nd century, Eobard was a fan of the Flash and wanted to be just like him and replicated his powers, only to learn through time travel that he was destined to be Flash's arch-enemy.
Split into simpler sentences: Hailing from the 22nd century, Eobard admired the Flash and wanted to be able to replicate his powers. But to his to dismay, he learnt, through time travel that he was destined to be the Flash's arch-enemy.