Complex sentence: Christ Church or the Old Cathedral on Holmen was the main church and cathedral of Bergen and was built by King Olav Kyrre during the period 1066-1093.
Split into simpler sentences: Christ Church or the Old Cathedral on Holmen ("Kristkirken på Holmen i Bergen") was the main church and cathedral of Bergen. The church was built by King Olav Kyrre during the period 1066-1093.