Complex sentence: Rosenqvist immediately employed his car's full power potential and was the fastest driver in the fourth (and final) group, ahead of Bird who equalled Vergne's pace at first but his rear tyre made contact with the wall which cost him time.
Split into simpler sentences: Rosenqvist immediately employed his car's full power potential and was the fastest driver in the fourth (and last) group. He finished ahead of Bird, who equalled Vergne's pace at first, but then made contact with the wall with his rear tyre which cost him time.