I haven't yet watched (finished) an anime with a super complicated plot, but I remembered a certain anime that my otaku schoolmate once recommended. I still remember her frustrations while retelling the story of Monogatari series—with its overlapping stories and timelines and also the order of the eps...In the end, she said that I should just try it.

Although it doesn't have a lot of eps, (I think it's just below 100 eps—based on the last time I researched it—totally not that many) I didn't finish it. I tried tried watching it, but the eps order got me baffled, so I ended up dropping and not really finishing it (can't blame myself 'cause I'm just a new otaku at that time lol ).