An indefinite pronoun is "a" or "an" - it will describe something not very well specified, something "indefinite".
In the examples above, the indefinite pronoun in found here:
<span>The team congratulated one another on a job well done.
(I marked it with boldface).
</span>
Complex sentence. It has a subordinate clause
Answer:
Four classmates of mine have won a trip to see the Brooklyn Bridge on the Twenty Sixth of June.
Explanation: