It will stand alone as a sentence, therefore it is the independent clause.
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Dependent clauses modify the independent clause of a sentence or serve as a component of it.
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The second clause is dependent and therefore does not require a comma to separate it from the first independent clause.
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A sentence with an independent clause and one or more dependent clauses is referred to as a complex sentence.
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In linguistic typology, a null-subject language is a language whose grammar permits an independent clause to lack an explicit subject.
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Subordinating conjunctions, also called subordinators, are conjunctions that conjoin an independent clause and a dependent clause.
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The future subjunctive appears in dependent clauses that denote a condition that must be fulfilled in the future so that the independent clause will occur.
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Dependent clauses are those that would be awkward or nonsensical if used alone, and must be used in a sentence also containing an independent clause.
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Note, however, that in German when the independent clause comes after a subordinate clause the conjugated verb comes before the subject.