Complex sentence: Along with his band, The Old Firm Casuals, he wrote the new anthem and theme song, "Never Say Die", for the club, which was performed as part of the team's rebranding ceremony on January 30,2014.
Split into simpler sentences: Along with his band, The Old Firm Casuals, he wrote the new anthem/theme song for the club. The song, "Never Say Die," was performed as part of the team's rebranding ceremony on January 30,2014.