Complex sentence: Hesitant to return a favor at such a pivotal time of the year, Bryan declines but Erik, discovering his operatic abilities, commends Mumble for his bravery and lectures Bryan for his lack of kindness.
Split into simpler sentences: Hesitant to return a favor at such a pivotal time of the year, Bryan declines. Using his singing abilities, Erik commends Mumble for his bravery and lectures Bryan for his lack of kindness.