Complex sentence: After the true extent of the damage was revealed, the IDF claimed the ship had been hit by an Iranian c-802 antiship missile which was only able to hit the Hanit because its sophisticated automatic missile defense system was not deployed.
Split into simpler sentences: After the true extant of the damage was revealed, the IDF claimed the ship had been hit by an Iranian c-802 antiship missile. And that the missile was only able to hit the Hanit because it's sophisticated automatic missile defense system was not deployed.