Complex sentence: Riese (German for "giant") is the code name for a construction project of Nazi Germany in 1943--45, consisting of seven underground structures located in the Owl Mountains and Książ Castle in Lower Silesia, previously Germany, now a territory of Poland.
Split into simpler sentences: Riese (German for "giant") is the code name for the construction project of Nazi Germany in 1943--45. It consists of seven underground structures located in the Owl Mountains and Książ Castle in Lower Silesia, previously Germany, now territory of Poland.