The si clauses are made up of two separate clauses - a past subjunctive clause followed by a conditional clause. These kinds of statements are known to grammar experts as contrary-to-fact clauses, as well.
Note the following examples with translations. If you need extra help, or you really want to learn this subject matter, buy a $10 one hour lesson! Baratísimo....
Si Juan tuviera un plan, esto no sucedería. If Juan had a plan, this wouldn't have happened.
Si yo ganara la lotería, compraría un avión Cessna. If I won the lottery, I would buy a Cessna airplane.
Si el gobierno supiera ahorrar dinero, no estaríamos en una crisis económica. If the government knew how to save money, we wouldn't be in an economic crisis.