Complex sentence: The church was built here because in the Viking age, Tingvoll was a court place for all of the Nordmøre region, which is why the church is sometimes called "Nordmørsdomen", meaning the Nordmøre cathedral.
Split into simpler sentences: The church was built here, since during the pre-Christian era, Tingvoll was an assembly place ("ting ") for all of the Nordmøre region. As a consequence the church is sometimes called"Nordmørsdomen", meaning the Nordmøre cathedral.