What can we do if landlord said we could get a year lease but now was told that lease is non-renewable?

I do not understand why the landlord would want to evict you unless he is planning to make a large increase in the rent. Your problem is going to be the written lease says 6 months and nothing about a renewal. In general, you are not allowed to vary the clear terms of a written agreement by any verbal agreements [parole evidence rule otherwise, people would just claim there was a verbal agreement so no written agreement would hold up]. You could try to argue that the landlord mislead you by promising to extend the lease, but it becomes your word against his and since you have the burden of proof it would be difficult to convince a judge to find for you unless there was another witness to what was promised or some other evidence. Talk to the landlord to try to find out why he wants you to leave; why give up a tenant who is paying rent to have to go through the time and expense to find a new one.