Hi,
Do the following sentences convey the same meaning? Generally speaking, although version 2 clearly speaks of one increase and version 1 does not.
Also do I need to use articles before nouns preceded by past-participle adjectives ( for example, ‘increased G&A expenses’)?
The presence of an adjective makes no difference.
You can speak of a painted chair / the painted chair / painted chairs or of a chair / the chair / chairs. It just depends on what kind of reference you want to make, eg general , definite, indefinite.
In the same way, you can speak of an increased staff level / the increased staff level / increased staff levels.
1. Increased staffing levels to add development capacity was one of the reasons behind the increased G&A expenses.
2. An increase in staffing levels to add development capacity was a reason for the increase in G&A expenses.
Best wishes, Clive