Complex sentence: The "Kirchenbauverein Berlin" ("Berlin Church-Building Association"), which also built the Church of the Redeemer, dug the finds up, and the foundations and a hypocaust can now be viewed in a protective building.
Split into simpler sentences: The "Kirchenbauverein Berlin" ("Berlin Church-Building Association"), which also built the Church of the Redeemer, dug the finds up. The foundations and a hypocaust can now be viewed in a protective building.