How to place pauses in a sentence when speaking?

Question

I would like to know how to place pauses in a sentence when speaking (besides pauses on comma and semicolon) to deliver a better message to audiences. I researched this for a while but I don't find any formal documents on this subject on the internet.

Here is an example I found:

Now that you have reduced the word count of your presentation // you need to prepare your message in shorter, // simpler // chunks. To do this well // you need to consider where to place stress in words and in sentences, // where to pause naturally in your speech // and where // to pause for effect.