15 And after he became the father of Eber, Shelah lived 403 years and had other sons and daughters.

Read Genesis 11:15 Using Other Translations

And Salah lived after he begat Eber four hundred and three years, and begat sons and daughters.
And Shelah lived after he fathered Eber 403 years and had other sons and daughters.
After the birth of Eber, Shelah lived another 403 years and had other sons and daughters.