What are three sentences complex sentences about space exploration

Complex sentences are those types of sentences that is being made up of an independent clause and at least one dependent clause. Clauses are group of words that have a verb and a subject. An independent clause expresses a complete thought while dependent clause does not and cannot stand alone. Here are the following examples of complex sentences on space explorations:

Because the space is too vast, explorers are sent to discover its composition.

Though there are financial problems, he still decided to explore the outer space.

The outer space, though very dangerous, was full of wonderful discoveries.