By default Microsoft Windows Server 2012 enforces users to use strong passwords. However there is the simple steps to disabled password complexity requirements on Windows Server 2012.
1. Open the Start screen and click the Administrative Tools icon.
2. In Administrative Tools folder, double click the Local Security Policy icon.
3. Expand Account Policies and click Password Policy.
4. In the right pane double click Password must meet complexity requirements and set it to Disabled. Click OK to save your policy change.