You may find the "News" app is more to your liking.
By default, on the Front page (Nabble's name for the "Landing page") it limits the summary of the post to 500 characters. with a "Read more..." link.
Better still, it is also has a mechanism (Options > Application > Extras & add-ons > Content > Custom summary for Newspaper) to provide a customised summary of the post so it doesn't even have to replicate the first five hundred characters of the post. You can also use it to replace the default image (which is taken from the first image within the post) with one only seen in the summary shown on the Front page.
To remove the People table try the option at:
Options > Application > Change appearance > Preferences > Page Layout > Narrow
This removes the sidebar on both the News and Blog apps.
Should you still wish to use the Blog app within the macros for the News app you will find code that makes it easy to see how to limit the length of the summary.
Volunteer Helper - but recommending that users move off the platform!
Once the admin for GregHelp now deleted.