Complex sentence: He got to perform in the finale of season 4 as a guest performer and after auditioning again in season 5, he made it to the finals, where he was eliminated in the Top 12 of the season.
Split into simpler sentences: He got to perform in the finale of season 4 as a guest performer. After auditioning again in season 5, he made it to the finals, where he was eliminated in the Top 12 of the season.