Complex sentence: Fatigue duty is the part of a soldier's work distinct from the use of arms, a kind of duty assignment, mainly consisting of occasional non-military or military-related work performed by soldiers, in addition to drill duties.
Split into simpler sentences: Fatigue duty is the part of a soldier's work distinct from the use of arms. A kind of duty assignment, mainly consisting of occasional non-military or military-related work performed by soldiers, in addition to drill duties.