Complex sentence: Gökgöl Cave was flooded in 2014, and remained closed to visitors until 2016; after removing the infrastructure damage caused by water and mud, and taking measures to guard against possible flooding in the future, the cave was re-opened in May 2016.
Split into simpler sentences: Gökgöl Cave was flooded in 2014, and remained closed to visitors until 2016. After removing the infrastructure damage caused by water and mud, and taking measures to guard against possible flooding in the future, the cave was re-opened in May 2016.