Complex sentence: AMG was a business unit within Alliance Entertainment Corporation from 1996 until early 2005 which was acquired in 1999 by Yucaipa Companies, a multi-billion dollar fund based in California.
Split into simpler sentences: AMG was a business unit within Alliance Entertainment Corporation from 1996 until early 2005. Alliance was was acquired in 1999 by Yucaipa Companies, a multi-billion dollar fund based in California.