Complex sentence: The men of the Sharpshooters regiment were armed with various types of rifles, including the Sharps rifle, the Whitworth rifle, sporting arms, and various other custom-made privately owned target weapons.
Split into simpler sentences: The men of the Sharpshooters regiment were all usually armed with various different types of rifles. Some of these arms included: the Sharps rifle, Whitworth rifle, sporting arms and various other custom made privately owned target weapons.