Complex sentence: By the middle 19th century, the blunderbuss was considered obsolete and was replaced in military use by the carbine Though the latter was considered by some to be a poor replacement, and the blunderbuss still found use with civilians as a defensive firearm.
Split into simpler sentences: By the middle 19th century, the blunderbuss was considered obsolete. The blunderbuss was replaced in military use by the carbine, though the latter was considered by some to be a poor replacement, though the blunderbuss still found use with civilians as a defensive firearm.