question about editing quotes from a source

Hi all. It's been a very long time since I've checked in here...I'm happy to see the forums are still around!

I have a question about editing quoted material from an interview source. If an interviewee's comments could be changed ever-so-slightly to make a little more sense, is it ok/ethical to do so? I'm working on an advertorial (my first project of this nature, actually) in a Q & A format, and while most of the subject's answers are presented clearly--the interview was done via email--a few spots could use a little clean up. A more concrete example:

Original quote: As a person and community member, giving to these organizations is important to help those less fortunate or who need a helping hand to get back on their feet.

How I'd like to revise it: Giving to these organizations is an important way to help those who are less fortunate, or who need a helping hand...

I know I should technically place [is], [an], and [who are] like so, but that makes the text appear messy. Thoughts/advice? Thanks in advance!

Ok, then...I just saw a post asking essentially the same question. Should have consulted the rest of this section first, I guess!

Thanks, all. I did end up using brackets for [is] and [and]. It doesn't look too bad...and the point is still made w/o altering the speaker's words.