Complex sentence: Although Arthur Pendragon had been involved in consultation meetings with English Heritage for over 10 years, he believed that things were moving far too slowly; the consultation costs were escalating at over £7 million.
Split into simpler sentences: Although Arthur Pendragon had been involved in consultation meetings with English Heritage for over 10 years. Arthur could see that things were moving far too slowly and the consultation costs were escalating at over £7 million.