Complex sentence: In 2008, the "Houston Chronicle" ranked National Oilwell Varco as the best company in Greater Houston, in 2007 the newspaper ranked National Oilwell Varco number 15.
Split into simpler sentences: In 2008, the "Houston Chronicle" ranked National Oilwell Varco as the best company in Greater Houston. In 2007 the newspaper ranked National Oilwell Varco number 15.