Complex sentence: Lunan was a founder of ASTRA, supervision of the conception and construction of the Sighthill stone circle, and committee activities on the Argyle Local Housing Association, which is linked to the GHA, including serving as chairman from 2002 to 2006.
Split into simpler sentences: Lunan was a founder of ASTRA, He was supervision of the conception and construction of the Sighthill stone circle. He has also served with committee activities on the Argyle Local Housing Association, which is linked to the GHA, including serving as chairman from 2002 to 2006.