Can I remove some content from my posts in RSS feed?

Hi:

In all my blog posts, there are four areas that I want to remove from my RSS feeds:
1. Subscribe to newsletter box (near top of post)
2. Request PDF of article box (near top of post)
3. Related Articles List (near bottom of post)
4. Advertisement CTA for my book sales (at bottom of post)

Apart from this there is a green box inset right at the top of the post which in the RSS feed does not stand apart but gets mixed in as the first paragraph of text.

How can I remove the four unwanted areas from my RSS feed and also preserve the green box at the top of my posts with its separation from the rest of the post text?

The page I need help with: [log in to see the link]