Complex sentence: At the half-way point, the Hawthorn/Titteringham Jaguar was now back in the lead, when Fangio/Castellotti pitted.by now, more than a third of the field had retired.
Split into simpler sentences: At the half-way point, the Hawthorn/Titteringham Jaguar was now back in the lead, when Fangio/Castellotti pitted. By now, more than a third of the field had retired.