Complex sentence: The SS-N-1 was superseded by the SS-N-3 "Shaddock" fitted to 4,000-ton Kynda class cruisers, which replaced an initial plan for 30,000-ton battlecruisers armed with 305 mm and 45 mm guns.
Split into simpler sentences: The SS-N-1 was superseded by the SS-N-3 "Shaddock". This weapon was fitted to 4,000-ton Kynda class cruisers and replaced an initial plan for 30,000-ton battlecruisers armed with 305 mm and 45 mm guns.