Translation: Normally, in this context, they do not administer insulin unless your blood sugar reaches a certain level (12 mmol/l). In this experiement they divided the patients into two groups: One group received the standard treament, the other received an aggressive treatement where they kept the insulin level at a much lower level. They found that more people survived with this more aggressive insulin therapy. After some number crunching they have come to the conclusion that the lower death rate was due to the fact this therapy elevates cholesterol levels.

Is that clearer?

The significance of this, IMO, is that's it another nail in the coffin for those people who insist that cholesterol (LDL) is a nasty nasty substance that must be controlled/lowered) at all cost. (Statins). There already is a link between low cholesterol and higher mortality and some talk about the protective role of cholesterol against infection. Talk which has been mostly ignored as far as I can tell. So this why this study is significant.