complex sentence - definition and synonyms

noun [countable] linguistics  /ˌkɒmpleks ˈsentəns/
singularcomplex sentence
pluralcomplex sentences
  1. a sentence consisting of an independent clause and one or more subordinate clauses. Subordinate clauses usually begin with a subordinating conjunction like ‘because’, ‘as’, or ‘when’. For example, ‘As the 19th century came to an end, gold was discovered in Alaska and the Yukon’ is a complex sentence.