Complex sentence: As Takanobu takes care of Muna, he finds him a job cleaning stables.On one New Year's Eve a fire happens at the Red Dog where Takanobu found Muna and sent him to do an errand.
Split into simpler sentences: As Takanobu takes care of Muna, he finds him a job cleaning stables. But one New Year's Eve, a fire occurs at the Red Dog where Takanobu met Muna and sent him to do an errand.