<p>Helping sponsor a less-fortunate child to attend school in an impecunious country and having field days with autistic children at my school have allowed me to be cognizant of our worlds diverse population. </p>
<p>OR</p>
<p>Helping sponsor a less-fortunate child to attend school in an impecunious country and having field days with autistic children at my school has allowed me to be cognizant of our worlds diverse population.</p>
<p>I think “has” is correct in this case because each clause is treated separately. If you want to use “have” you would say “…have BOTH…”. And, I would say ‘…has made me more aware of…’ rather than “…allowed me to be more cognizant…” The former flows better while the latter can be a tongue twister.</p>
<p>Also, I’d use another word for penniless, as “impecunious” sounds too stilted. Maybe ‘impoverished’ would fit better.</p>
<p>I have become aware of our world’s diverse population by helping to enable a child in an impoverished country to attend school. I also organized field days with autistic children.</p>
<p>Or something like that. Shorter sentences can be more effective. If you have to work to keep track of the subject, that’s not a good thing. Your readers certainly don’t want to work that hard.</p>
<p>One thing, though, drop the first “to”, so that it would read “…by helping enable a child in an impoverished country to attend…” - Now you have just one “to” and it flows better.</p>