Yes, if you look at http://www.cic.gc.ca/english/work/low-skill.asp it says that they could get a 6 month extension without having to leave Canada.
If you look at http://www.cic.gc.ca/english/information/faq/work/index.asp#low it looks like if you get them a new LMO, you could keep them another 2 years. You might want to ask Service Canada about this or call CIC.