This one is easy! The big difference to your sauce will be the kind of tomatoes you use.
Hand crush a can of San Marzano tomatoes in a sauce pan. Also add a small can of tomato sauce and a small can of tomato paste.
Finely chop half an onion – sauté this in a pan with olive oil (use good olive oil) and garlic and then add this to your sauce pan.
Add oregano to your pan as well as basil, salt, and pepper.simmer