Okay did you SEE the amount of effort it took for Sidious to hide, remain undercover AND train Darth Maul? This , of course, being after he killed his own master (Plagus). All while forming a giant empire and preparing for the ‘chosen one’. And then Maul got his ass kicked after accomplishing pretty much nothing except killing Qui Gon (big whoop).
Then he has to convert Anakin to the dark side, turn three factions against each other, create an intergalactic coup, simultaneously kill almost all the Jedi, retain control of his new empire and build a giant planet-killing space station as Darth Vader emerges. Finally, he has to quell an all-out rebellion while (secretly even to audiences) helping Vader train Starkiller and then build ANOTHER giant planet-killing space station.
Yeah, no wonder he looked all fugly. I’m amazed there’s even ONE Sith, how the hell could anyone have time to train?