Complex sentence: The improved Charlie IIs were built at Gorkiy with an 8m (26 ft 3in) insertion in the hull forward of the fin to incorporate electronics and launch systems for targeting and firing of the long range P-120 Malakhit anti-ship missile.
Split into simpler sentences: The improved Charlie IIs were built at Gorkiy with an 8m (26 ft 3in) insert in the hull forward of the fin. The insert incorporated electronics and launch systems for targeting and firing of the long range P-120 Malakhit anti-ship missile.