Change Password Policy for AD and domain users
To change the password policy we'll have first to open Group policy management which is located in "Administrative Tools" on your DC
Right click on "Default Domain Policy" in order to change the password policy for all users within a domain.
This will open the Group Policy Management editor as you can see below where you will have to navigate to "Computer configuration -> Security Settings -> Password Policy" and there you can disable the password complexity, adjust it or change any other settings.
Next when the Group policy opens up the configuration I will go to "Account Policies" and disable the "Password must meet complexity requirements" since this is what I simply want do in my case.
After changing the policy you will need to force updating the policy on all the domain joined clients by using the command line GPupdate /force
When this is finished, all clients must be restarted in order for the group policy change to take effect.