Here’s the sentence with improved separation for clarity:
“If you are a non-resident or a resident alien who needs to file a tax return in the US, you may need an Individual Taxpayer Identification. If you need to apply for an ITIN, we can assist you. By applying for an ITIN along with your tax return through us, you can save time and avoid hassle. Contact us today to find out more about our ITIN application service.”