Complex sentence: Work-at-home and telecommuting scams are very common; many of these job offers are scams appealing to a "get rich quick" mindset but in fact require an investment up front with no pay off at the end.
Split into simpler sentences: Work-at-home and telecommuting scams are very common. Some of the job offers are scams appealing to a "get rich quick" mindset but in fact require an investment up front with no pay off at the end.