Complex sentence: These students undergo an intensive nine week training program lead by experienced members of the Guild, which concludes with an audition whereby the most skilled auditioners ("heelers") are admitted to the Guild and allowed to perform regularly on the carillon.
Split into simpler sentences: These students undergo an intensive nine week training program lead by experienced members of the Guild. The program concludes with an audition process whereby the most skilled auditioners ("heelers") are admitted to the Guild and allowed to perform regularly on the carillon.