Yes, you can definitely insert your AdSense or else network ads inside WordPress articles after few paragraphs as per your need. For that purpose, I would suggest you to install and active insert post ads plugin because via this plugin you will be able to add AdSense ad unit before, after and inside post content like after 2,3,4 paragraphs as you like to setup.
You also can add AdSense code before and after post content by editing
single.php file, which you can find from WordPress root directory or WordPress Dashboard > Appearance > Editor > Single.php
Plugin is recommended because plugin can be used in multiple conditions unlike manual procedure.