Complex sentence: In 684 the kabane were reformed into the eight kabane system (八色の姓, "yakusa no kabane"), but as the clans began to devolve into individal households, the kabane system gradually faded from use.
Split into simpler sentences: In 684 the kabane were reformed into the eight kabane system (八色の姓, "yakusa no kabane"). Later, as the clans began to devolve into individual households, the kabane system gradually faded from use.