Complex sentence: After Iwakuni Castle was completed in 1608 by Kikkawa Hiroie, who was the first lord of Iwakuni Domain, a series of wooden bridges were built, all of which were destroyed by floods several times before the construction of the iconic Kintai Bridge.
Split into simpler sentences: After Iwakuni Castle was completed in 1608 by Kikkawa Hiroie, who was the first lord of Iwakuni Domain, a series of wooden bridges were built. But all of them were destroyed by floods several times before the construction of the iconic Kintai Bridge.