Complex sentence: Monsoons hit South Asia every year between June and September, but the 2017 monsoon season has been far worse than average, bringing flooding, and associated landslides, of a scale unseen in recent years.
Split into simpler sentences: Monsoons hit South Asia every year between June and September, but the 2017 monsoon season has been far worse than average. The monsoon rains have brought flooding, and associated landslides, of a scale unseen in recent years.