a clause that modifies the principal clause or some part of it or that serves a noun function in the principal clause, as when she arrived in the sentence I was there when she arrived or that she has arrived in the sentence I doubt that she has arrived.
Albeit means though: howbeit always nevertheless, beginning not a subordinate clause, but a principal sentence.
Do not use a semicolon between a clause and a phrase, or a main clause and a subordinate clause.
By their commas ye shall know them, and by their usage of the semicolon and the subordinate clause.
Students will understand that a subordinate clause is a dependent clause and does not express a complete thought.
British Dictionary definitions for subordinate clause
subordinate clause
noun
1.
(grammar) a clause with an adjectival, adverbial, or nominal function, rather than one that functions as a separate sentence in its own right Compare coordinate clause, main clause