Complex sentence: The grocery chain was founded by Joe Albertson in 1939 in Boise, and the company was headquartered in the city until 2006, when it was acquired by Supervalu of Eden Prairie, Minnesota.
Split into simpler sentences: The grocery chain was founded by Joe Albertson in 1939 in Boise. The company was headquartered in Boise until 2006, when it was acquired by Supervalu of Eden Prairie, Minnesota.