Help with Semicolon please

Hi,
I’ve just installed a plugin found here: https://www.thunderguy.com/semicolon/wordpress/evermore-wordpress-plugin/ for my blog https://www.seoprinciple.com/

The plugin displays only the 1st paragraph of my posts. How can I change the php code so it shows 2, or 3 paragraphs instead of 1, which is not enough IMO.

The plugin can be found here: https://www.thunderguy.com/semicolon/plaintext/evermore.php

Thanks very much for your help,
Nadir