Complex sentence: The DWP responded by pointing out that association does not imply causation: the rise in mental health issues when the WCA was deployed after 2010 could just have been a coincidence; the researchers said they had found no other explanation for the rise.
Split into simpler sentences: The DWP responded by pointing out that association does not imply causation: the rise in mental health issues when the WCA was deployed after 2010 could just have been a coincidence. The researchers said they had found no other explanation for the rise.