Yes, a one-year separation is the only "no fault" grounds for divorce in Maryland.
Yes, if there is a Divorce where the parties agree on the grounds for the actual divorce. Furthermore, if the parties can resolve all the issues relating to the marriage through a marriage settlement agreement. Parties can file under a mutual consent divorce.
There are also exceptions to get being separated for one year if you can prove those set of circumstances (ie: abuse, cruel and unusual treatment).