How can I get out of a rental lease?

You have given very little detail about the problem language in the lease.  However, generally, a lease will be enforceable unless the ambiguity is so significant that the courts conclude that the parties never reached "a meeting of the minds" about the essentially subject matter of the lease.  Otherwise, the courts will apply rules of contract interpretation to try to figure out what the parties meant.   So, unless the lease is so ambiguous as to not make much sense, I doubt that you will be able to get out of it.