Ask HN: resources for improved writing at work?

I lead a team that needs to communicate with various stakeholders (usually in writing). I've noticed a number of issues in their writing:

1. Too wordy 2. Filled with jargon or "fancy-sounding" words that obscure their meaning 3. A lot of passive voice 4. Poor logic. Not sure if "logic" is the right word but it goes something like this: failing to see the difference between "the platform cannot do X" and "the platform can ONLY do Y".

Has anyone had any success improving the emails, docs, etc of their team? Any tips, links, etc are appreciated.