Please translate into Latin (this is for a couple of LAtinists who aregetting married)

You may be thinking of the verse in Mark
"What therefore God hath joined together, let no man put asunder."
The Latin Vulgate bible renders that as:
Quod ergo Deus iunxit homo non separet.
If you wanted to substite "Latin" for "God", you could say:
Quod ergo Latinitas iunxit . . .

The literal translation of the phrase you submitted would be:
Quod Latinitas contulit