Complex sentence: The Government Communications Security Bureau operates a satellite base in the Waihopai Valley, at, widely regarded as being part of the ECHELON spy network, run by the UKUSA alliance of intelligence agencies.
Split into simpler sentences: The Government Communications Security Bureau operates a satellite spy base in the Waihopai Valley, at. The Waihopai base is part of the ECHELON spy network, run by the UKUSA alliance of intelligence agencies.