How can I write this email in a professional manner by using headings/bullets? 

From: Susan Janzen 

To: All Staff Cc: IT Support 

Subject: Complaints

A bunch of you have complained to me about the new SharePoint structure being ridiculous to navigate. I looked into it and asked around. Most of you said it was fine, but a few kept insisting that our intranet is not organized and is totally nuts to use. To stop them whining, I looked into the matter further. I found that the people complaining about the intranet structure were mostly those consultants who work remotely and who mainly interact with the intranet from their phone. I have no idea why they are complaining because the IT Department offered lunchtime training sessions on how to use SharePoint on mobile devices and they didn't even bother coming!!!!!!! WE CANNOT HELP YOU IF YOU ARE UNWILLING TO ADAPT TO THIS TECHNOLOGY. SharePoint is here to stay, so you'd better get used to it.

To make sure everyone gets on board with SharePoint and other O365 apps, the IT Team is prepared to conduct further lunchtime training sessions throughout the coming weeks but only if people promise to actually come this time. We hope that settles the complaints.  ☹ ☹ ☹

I guess if you get stuck you could also go here https://support.office.com/en-us/sharepoint or watch this video or take one of these courses https://www.linkedin.com/learning/topics/sharepoint-online?u=2212217 or come by the IT office for drop-in help any weekday from 1-3 or maybe call someone or ask a friend.