Complex sentence: The Sunshine catalogue remained in the archive of Festival Records until that company went into liquidation in 2005, when the combined Festival-Mushroom Records recording archive was sold to the Australian division of the Warner Music Group for a reported A $10 million.
Split into simpler sentences: The Sunshine catalogue remained part of the assets of Festival Records until that company went into liquidation in 2005. The combined Festival-Mushroom Records archive was sold to the Australian division of the Warner Music Group for a reported A $10 million.