Complex sentence: If a yard is over 50% destroyed, it will be under 12 hours of "damage protection", during which the yard cannot be attacked until either the time runs out or the protected player attacks another player, which removes the remaining protection time.
Split into simpler sentences: If a yard is over 50% destroyed, it will be under 12 hours of "damage protection". The yard cannot be attacked until either the time runs out or the protected player attacks another player, which removes the remaining protection time.