Complex sentence: Because of the sheer complexity and enormous scope of the task, it remains to be seen whether planetary management is a feasible paradigm for maintaining global sustainability, and the concept has defenders and critics on both sides arguing for and against it.
Split into simpler sentences: Because of the sheer complexity and enormous scope of the task, it remains to be seen whether planetary management is a feasible paradigm for maintaining global sustainability. The concept currently has defenders and critics on both sides, arguing for and against it.