Sourdough doesn't need to be complicated.

You get the starter by leaving flour and water at room temperature for several days. Once the starter is ready, it's just more flour and water, plus additional ingredients (salt, seeds, olive oil, etc) sitting for several hours until it's ready to go in the oven.

I've followed sourdough recipes that were extremely complicated, which required me doing task every few hours for 3 days (so no way to do it if you have a regular job). But at the most basic level sourdough is just a fermented mixture of flour and water that is then cooked.