Have I correctly written the sentence using ‘where many, if not all, other people’?
According to a newspaper columnist, single parents do the most difficult jobs in the world, where many, if not all, other people can see them pass through several cycles of sacrifice.
No. You're trying to cram too much into one sentence. Say eg According to a newspaper columnist, single parents do the most difficult job in the world.
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No.
You're trying to cram too much into one sentence.
Say eg According to a newspaper columnist, single parents do the most difficult job in the world. Many, if not all, other people see them make many kinds of sacrifice.
Your meaning in the last part is not clear to me. What is 'a cycle of sacrifice'?