Complex sentence: Holleman is now a senior litigating attorney at the Southern Environmental Law Center, where he has led the effort to litigate against power utilities over the disposal of coal ash, especially in the wake of the 2014 Dan River coal ash spill.
Split into simpler sentences: Holleman is now a senior litigating attorney at the Southern Environmental Law Center. He has lead the Center's effort to litigate against power utilities over the disposal of coal ash, especially in the wake of the 2014 Dan River coal ash spill.