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Because answers the question "Why?". After it you need a full clause with a subject and a verb: because + it is reliable. The reason usually comes second; if you start with because, separate the two parts with a comma.
main clause + because + subject + verb
Although means "in spite of the fact that". It introduces the less important or surprising fact, and the main clause gives your real point. The although-clause can come first (with a comma) or second.
Although + subject + verb, main clause