Complex sentence: An alarm sent from the area near the fire also failed to register at the courthouse where the fire watchmen were, while the firefighters were tired from having fought numerous small fires and one large fire in the week before.
Split into simpler sentences: An alarm sent from the area near the fire also failed to register at the courthouse where the fire watchmen were. Also, the firefighters were tired from having fought numerous small fires and one large fire in the week before.