Complex sentence: Nguyen's support from the Vietnamese American community suffered a sharp reversal in early January 2008, in a controversy over whether a San Jose neighborhood with a preponderance of Vietnamese-owned businesses should be renamed as "Little Saigon" or "Saigon Business District".
Split into simpler sentences: Nguyen's support from the Vietnamese American community suffered in early January 2008, in a controversy concerning a predominantly Vietnamese-owned business area in San Jose. The issue was whether the neighborhood should be renamed as "Little Saigon" or "Saigon Business District".