Is this a shift in tense?
Solution 1:
The subject of your sentence is Pittsburg Public and the verb is managed.
This makes, in a sense, the rest of the sentence a kind of object. The this tradition is the direct object, since you could end the sentence right here. The word bringing is a gerund:
ger·und
/ˈjerənd/
a form that is derived from a verb but that functions as a noun, in English ending in -ing, e.g., do you mind my asking you?.
making the rest of the phrase an indirect gerund phrase. It's indirect because it can't stand on its own as a separate sentence.