(In reply to Very Simple Solution.
by Edward E. Kang)
The third sentence is not a run-on, but it has other mistakes besides the intended one (see lower comments). "It's not too hard to spot," need not be followed by a comma, since it is only a compound predicate. It's just a rather complex and awkward sentence that could be written better. But we all make mistakes; you yourself wrote a grammatically incorrect sentence in your comment.
Posted by Tristan
on 2003-11-14 21:57:13