Complex sentence: USS "Sea Robin" (SS-407), a "Balao"-class submarine, was a ship of the United States Navy named for the sea robin, a spiny-finned fish having red or brown coloring on its body and fins.
Split into simpler sentences: USS "Sea Robin" (SS-407), a "Balao"-class submarine, was a ship of the United States Navy named for the sea robin. This is a spiny-finned fish with red or brown coloring on its body and fins.