Complex sentence: It was rumoured this was prompted by the conflicting views of various politicians in charge of the department, especially over subsidies for renewable energy, and promoting the continued use of gas (most controversially from fracking).
Split into simpler sentences: It was rumoured this was prompted by the conflicting views of various politicians in charge of the department. Especially over subsidies for renewable energy, and promoting the continued use of gas (most controversially from fracking).