Original sentence: She became a naturalized citizen of the United States in May 2007.She resides in Los Angeles, in the home of late actress Helen Twelvetrees, with Townsend.Theron has been linked to Stephan Jenkins (lead singer of Third Eye Blind), and Craig Bierko before her current boyfriend,  Stuart Townsend, with whom she starred in the 2004 film Head in the Clouds, as well as in the 2002 film Trapped and 2005 Æon Flux
Edited sentence: Theron became a naturalized citizen of the United States in May 2007.Theron resides in Los Angeles, in the home of late actress Helen Twelvetrees, with Theron's long-time boyfriend Stuart Townsend, with whom she starred in the 2004 film Head in the Clouds, as well as in the 2002 film Trapped and 2005 Æon Flux