"The book offers a ton of profound principles" = main clause "on which to base your decisions and actions." = dependent clause (this dependent clause acts as an adjective clause because it's acting on "principles". The book offers a ton of profound (principles)<(on which to base your decisions and actions.) With this sentence, you can see the main clause more easily if you try to find where it would naturally stop. (The book)sub - (offers)verb - (a ton of profound principles)obj "The book offers a ton of profound principles." << As you can see, when adding a period, you can see this is a complete sentence. Everything after the period will be the dependent clause acting upon it.