The second verb (and any other non-conjugated verbs) really always form the end of the "sentence-bracket" (Satzklammer). However, in some cases it's possible to place parts of the sentence after this "closing bracket"; this position is called the Nachfeld.
This is especially common for long prepositional phrases (because it makes the sentence easier to understand):
Die Aufgabe wurde diesmal gelöst
durch eine zehnköpfige, aus Vertretern verschiedener deutscher Universitäten und technischer Hochschulen zusammengesetzte Expertengruppe.
The same is true long apositions.
It's also possible to place short prepositional phrases or apositions in the Nachfeld for stylistic reasons, in order to emphasize etc, and I'd put the "als X" in your example in the same category.
More details at canoo.