Complex sentence: Long ago, a dark faerie was imprisoned at the bottom of the sea as punishment for attempting to take over the realm, her name having been erased from history and the faerie remembered only as'the Darkest Faerie'.
Split into simpler sentences: Long ago, an evil faerie was imprisoned at the bottom of the sea as punishment for attempting to take over the realm. Her name was erased from history, the faerie herself to be remembered only as'the Darkest Faerie'.