Is this a simple, compound, or complex sentence?

While she was sleeping, we decorated the house for the party.

Review questions what were the four stated goals of operation reinhard and how were these implemented? how did treblinka, sobibor, and belzec differ from other concentration camps built earlier? how did the nazi party maintain secrecy regarding the final solution? why was the madagascar plan not used? why were some individuals, including wwi veterans, to be spared the final solution?

Which form does a verb take when the subject receives the action? passive active imperative indicative

What is the meaning of the word "caches" as it is used in paragraph 6