Complex sentence: After a slow start in the season when coach Damir Burić didn't use him much, he started delivering on the field and alongside Nikola Vlašić he proved to be the best Hajduk players in the season.
Split into simpler sentences: After a slow start in the season when coach Damir Burić didn't use him much, he started delivering on the field. He and Nikola Vlašić proved to be the best Hajduk players in the season.