Complex sentence: In 1982 St Mary's Church was moved into the precinct of the Cathedral of the Holy Trinity, a major feat of engineering when the church was transported across the road and turned through 90 o onto its present site.
Split into simpler sentences: In 1982 St Mary's Church was moved into the precinct of the Cathedral of the Holy Trinity. This feat of engineering took place in 1982 when the church was moved across the road and turned through 90 o onto its present site.