Complex sentence: In 2012, academic critics argued that the paper used flawed methodology, and that the underlying data did not support the authors' conclusions, which in turn led to unjustified adoption of austerity policies for countries with various levels of public debt.
Split into simpler sentences: In 2012, academic critics demonstrated that the paper used flawed methodology, and that the underlying data did not support the authors' conclusions. Consequently, its critics hold that this paper led to unjustified adoption of austerity policies for countries with various levels of public debt.