Welcome back! If you missed the first two parts, you can check them out here: Part 1; Part 2.
Parser combinators allow you to create a parser simply with C# code, by combining different pattern matching functions that are equivalent to grammar rules. They are generally considered to be best suited for simpler parsing needs. Given that they are just C# libraries, you can easily introduce them into your project: you do not need any specific generation step and you can write all of your code in your favorite editor. Their main advantage is the possibility of being integrated in your traditional workflow and IDE.