Complex sentence: However, he did not do the Dresden book "Ghost Story" due to a scheduling conflict, leaving fellow "Smallville" alumnus John Glover to record it; this caused a fairly noteworthy public outcry by audiobook listeners.
Split into simpler sentences: However, he did not do the Dresden book "Ghost Story" due to a scheduling conflict. His inability to narrate "Ghost Story" caused a fairly noteworthy public outcry by audiobook listeners.