To enhance the WordPress default formatter’s flexibility, this plugin 
enables configuring content and excerpt styles with various formats.
<h4>Features</h4>
<ul>
<li>Replaces “br” tags with “p” tags.</li>
<li>Produces valid XML parser for all sources.</li>
<li>Automatically generates excerpts in chosen length. Enables configuring following settings; length, separator elements (period, 
touten, paragraph), read more text, tags which you allow in excerpts, 
and etc..</li>
<li>Add any tags or texts to one’s contents as header and footer.</li>
</ul>
<h4>Demo</h4>
See this plugin working on <a href="http://www.wembley.jp/" rel="nofollow ugc">my blog</a>. Contents and excerpts in this site are generated by this plugin.

Plastic Post Style

記事本文と抜粋の出力を調整・カスタマイズします。Configure content&excerpt styles of all posts with various configurations.

Tim Eckel

Try it out on a free dummy site here => <a href="https://demo.tastewp.com/read-more-excerpt-link" rel="nofollow ugc">https://demo.tastewp.com/read-more-excerpt-link</a>
When WordPress makes an excerpt from your post content, it crops the content and adds an ellipsis […] to the end. This plugin changes the ellipsis to a Read More link to the full post content.
You can change the Read More link text to anything you wish from the Read More Excerpt submenu on the WordPress Settings menu.
Also from the Read More Excerpt submenu, you can specify the excerpt word length (WordPress defaults to 55 words).
Additionally, you can force the Read More link to show even when an excerpt is entered or when a read more tag is added to the content. This is turned on from the Read More Excerpt submenu with the Show More Frequently checkbox.
The Read More link uses the class read-more-link, so you can stylize the link any way you wish.

Plastic Post Style vs Read More Excerpt Link