Hi,
You can keep it simple as I do when I write an email to all the staff members. The first line should introduce the new joiner by stating their full name and welcoming them to the company. Then, mention their designation and reporting duties. The next line should include their latest qualification, previous profile, and company name.
Following that, you can write about his hobbies and interests so that all the current employees can engage with him, starting with his interests. This way, the new employee will feel accepted in the company.
Lastly, you can mention, "Let's all join hands to welcome XYZ to our team and hope his/her association with us is long and fruitful."
Regards,
Your Name
After this, I will take him around the office to introduce him personally, as by this time, people will know that someone new has joined. Try this out; it's effective.