Complex sentence: For hackathons that last 24 hours or longer, especially competitive ones, eating and sleeping are often informal, with participants often subsisting on food like pizza and energy drinks, and possibly sleeping on-site with sleeping bags and the like.
Split into simpler sentences: For hackathons that last 24 hours or longer, especially competitive ones, eating is often informal, with participants often subsisting on food like pizza and energy drinks. Sometimes sleeping is informal as well, with participants sleeping on-site with sleeping bags and the like.