Complex sentence: Lager Helgoland, a Nazi concentration camp on Alderney in the Channel Islands named after the Frisian Island of Heligoland (in English, Helgoland), a former British possession handed over to Germany in 1890.
Split into simpler sentences: Lager Helgoland, a Nazi concentration camp on Alderney in the Channel Islands. It was named after the Frisian Island of Heligoland (in English, Helgoland), a former British possession handed over to Germany in 1890.