Using "&" and "|" in SSHPass script
SSH accepts single argument as a command, not multiple ones, so the command line should look like this (note the quotes):

sshpass -p Password ssh maliciouzzhd@10.0.0.1 "export DISPLAY=:0 &amp; mate-session-save --force-logout"


But the general idea might not work, because you didn't allow X11 forwarding (add -Y switch to the ssh).