Complex sentence: Second-place finisher di Grassi said that he was delighted with the result and that his race had been "crazy" which demonstrated that this team they did not stop and it was "a great start" to his season.
Split into simpler sentences: Second-place finisher di Grassi said that he was delighted with the result and that his race had been "crazy". He added that his team never gave up, and his finish was "a great start" to his season.