It has been 10 years since the Great East Japan Earthquake.

Once again, I pray for the souls of those who died in the disaster and extend my deepest sympathies to those affected by the disaster.

I think my volunteer works there is the most memorable event I've ever experienced.

Now, I can't do what I could before, but I will continue to volunteer for reconstruction support.

↑Sounds natural？

Question

It has been 10 years since the Great East Japan Earthquake.

Once again, I pray for the souls of those who died in the disaster and extend my   deepest sympathies to those affected by the disaster.

I think my volunteer works there is the most memorable event I've ever experienced.

Now, I can't do what I could before, but I will continue to volunteer for reconstruction support.

↑Sounds natural？

Answer

Yes, absolutely. Not only does it sound very natural, but it has a semi-formal tone that's quite appropriate for the subject matter.