Complex sentence: According to them, the peak discharge in the Sabarmati in August 2006 was between 260,000 and 310,000 cusecs, which caused floods that washed away hundreds of hutments.
Split into simpler sentences: According to them, the peak discharge in the Sabarmati in August 2006 was between 260,000 and 310,000 cusecs. But this had caused floods that washed away hundreds of hutments.