Complex sentence: The games are usually showed in a "Picture Window", a special kind of window that can be created for graphical uses, and tend to be very simple, but there were attempts of making complex multiplayer games using mIRC.
Split into simpler sentences: The games are usually either text-based or graphical; if graphical, they are normally shown in a "Picture Window", a special kind of window that can be created for graphical uses. These mIRC games tend to be very simple, but there have been attempts of making complex multiplayer games using mIRC.