Complex sentence: Di Grassi narrowed the gap to Buemi to half a second with six laps remaining, and while thinking about an overtaking attempt on the e.Dams driver, both men were delayed by slower traffic, causing di Grassi to drop back.
Split into simpler sentences: Di Grassi narrowed the gap to Buemi to half a second with six laps remaining. Wwhile thinking about an overtaking attempt on Buemi, both men were delayed by slower traffic, causing di Grassi to drop back.