Improve the cohesiveness in the following paragraph.
Vettel went on to lead most of the race. A spark-plug failure meant that Vettel's lap times slowed down, and as a result the two Ferraris and the McLaren of Lewis Hamilton Vettel him.
Vettel went on to lead most of the race but a spark-plug failure meant that his lap times slowed down, and as a result the two Ferraris and the McLaren of Lewis Hamilton passed him.