Complex sentence: CamGSM was originally a joint venture between Millicom (61.5%) and the The Royal Group (38.5%), however, in 2009 The Royal Group acquired Millicom's share for US $346 million.
Split into simpler sentences: CamGSM was originally a joint venture between Millicom (61.5%) and the The Royal Group (38.5%). In 2009, however, The Royal Group acquired Millicom's share for US $346 million.