Xiǎo Bùshí dāng zǒngtǒng shí, Měiguó fādòng le Yīlākè Zhànzhēng.
While George W. Bush was president, the United States launched the Iraq War.
Tips
usage
小 'junior' and 老 'senior' tell father and son apart: 老布什 is the 41st president. Both are neutral and used in the news. The plain 布什 is used too, when the context makes clear which Bush is meant.