Complex sentence: Partly for this reason, Heertje emphatically against the extension of the A15 van Bemmel facing Zevenaar, thereby, the financing of each variant of that project are based on financial quicksand.
Split into simpler sentences: Partly for this reason, Heertje emphatically against the extension of the A15 van Bemmel facing Zevenaar. He argued, that the financing of each variant of that project are based on financial quicksand.