Complex sentence: Navy Arms models have a serial number that begins with the NA prefix followed by a 3-digit serial number and the slide is engraved on the left side with "N.A. Co. Ridgefield, NJ" in cursive script.
Split into simpler sentences: Navy Arms models have a serial number that begins with the NA prefix followed by a 3-digit serial number. The slide is engraved on the left side with "N.A. Co. Ridgefield, NJ" in cursive script.