There is a special rule when you sell property that you owned before a marriage, I'm not sure that applies here.
Even if you can split your exclusion in the way you want, it's not clear the rental property would even qualify. You say you owned it for 15 years and lived in it as your main residence for 14 months. You would have to have lived in that rental home as your main home for at least 2 years (731 days) of the past 5 years, not the past 15 years. The rule about suspending the 5 year rule only applies if you are deployed or on active service at least 50 miles from the home, and that still requires you to have lived in the home as your main home for 2 years. (For example, if you lived in the home 2 years from 2009-2011, the normal 5 year period to sell the home and use the exclusion would end in 2013. You can extend it to 2023 if you are on qualified extended duty. But qualified extended duty does not include living in the same area as the home and renting it, while you live in another home.)
And even if there is some way you could qualify, you still have to pay recapture on 15 years of depreciation, that recapture tax is paid before the exclusion is calculated.
