Complex sentence: The regimental sergeant-major is the senior sergeant major in a battalion-sized unit, including infantry battalions and artillery, armoured, engineer, and signal regiments; this appointment is normally held by a chief warrant officer.
Split into simpler sentences: The regimental sergeant-major is the senior sergeant major in a battalion-sized unit, including infantry battalions and artillery, armoured, engineer, and signal regiments. This appointment is normally held by a chief warrant officer.