Complex sentence: He suffered a hamstring injury before Hawthorn's Round 15 clash playing for Box Hill and returned to the Hawthorn line up in Round 21, stringing together the last two games of the season.
Split into simpler sentences: He suffered a hamstring injury before Hawthorn's Round 15 clash. He returned to Box Hill and returned to the Hawthorn line up in Round 21, stringing together the last two games of the season.