A subordinating conjunction is used to link a dependent clause, which is a phrase that is not complete by itself but provides extra information, to an independent clause which is complete by itself. Subordinating conjunctions include words such as after, before, until, while, because, if, even though, among others. In the case of "Kieran eats many fruits and vegetables because he wants to stay healthy" the independent clause is "Kieran eats many fruits and vegetables" which is the main point of the sentence and a complete sentence by itself, followed by the conjunction or link or the parts in a sentence "because" and finally the dependent clause "he wants to stay healthy" which is subordinating as it depends on the independent clause and cannot exist alone. Thus, the subordinating conjunction is "because" as it is the word that joins the independent clause and the dependent one in the sentence.
