I found a very long complex dative clause this morning.
“to the called ones” is the basic clause, but the noun is separated from its article by 8 words: 2 adjectival participial clauses each with its own subject, one expressed as a prepositional clause, the other as dative.
In God the father
to/by Jesus Christ
The kept ones
The called ones.
To the called, loved in God the Father and kept to/by Jesus Christ.
Whether the dative clause is dative of interest (for Jesus) or means (by Jesus) is debatable.