Complex sentence: In May 2011, The Wentworth Group of Concerned Scientists withdraw its support on the Murray Darling Basin Plan, who described the process as seriously flawed and a waste of taxpayers' money.
Split into simpler sentences: In May 2011, The Wentworth Group of Concerned Scientists walked out on the Murray Darling Basin Plan. The scientist group described the process as seriously flawed and a waste of taxpayers' money.