Limit the amount of words displayed by the Latest News plugin, or recommend an alternative [closed]

If you go into your /wp-content/plugins directory, and edit the latest-news.php file, on line 85 change:

<?php the_content('read more...');?>

… to:

<?php the_excerpt('read more...');?>

Note that modifying plugins is risky, because if you do an automatic update of the plugin after this, your changes will be modified. Because of this, it is advisable to branch your plugin before making changes.