Since you say this is a divorce decree, I think we must be in Texas. Juries are never involved in divorce proceedings in the United Kingdom, and the same is true in most of the United States. There are only eleven states that allow juries in any aspect of divorce litigation, and only in Texas, where jury trial rights are most broadly available in divorce, can juries decide on custody.
http://lawprofessors.typepad.com/family_law/2006/12/case_law...

In criminal cases, the right of a defendant to be tried by a jury is guaranteed by the US Constitution, and the defendant may waive (renounce) that right. But this is not a criminal case.

The phrase you have quoted, "A jury was waived, and questions of fact and of law were submitted to the Court", is routinely included in divorce decrees in Texas, but not, to my knowledge, anywhere else. Here is an example:
http://documents.jdsupra.com/98818dcc-95ce-4dec-904e-71c708b...

The point is that according to the Texas Family Code either party can demand a jury trial: either the petitioner (the spouse filing for divorce) or the respondent (the other spouse):

"Sec. 6.703. JURY. In a suit for dissolution of a marriage, either party may demand a jury trial unless the action is a suit to annul an underage marriage under Section 6.102."
http://www.statutes.legis.state.tx.us/Docs/FA/htm/FA.6.htm

So there is a jury if either party demands it (in practice, this only happens rarely). It follows that in order for there not to be a jury, and for the Court to decide matters of fact in a divorce in Texas, both parties have to waive that right: to choose not to demand a jury. That is what this means: both parties, both spouses, stated that they did not want the case to be heard by a jury.