I would like to know why [user] is suspended again, this time until Ago 2014.
Can anybody explain to me what happened?
As we have said repeatedly, we (moderators) do not share information about specific suspensions with anyone except other moderators and the SE team.* This means that the moderators will not explain to you what happened, and nobody else on this site knows what happened. While other non-moderator users may be able to give you examples of behavior that could have led to a suspension, they don't know what actually did lead to the suspension.
I can't speak for the Stack Exchange team, although I highly doubt they will discuss specific cases, either. Though they do frequently review suspensions internally, to make sure nothing untoward is going on.
Generally speaking, though, I will say that suspensions are imposed for violations of the site rules as outlined in the help center. The first two items on the behavior page ("be honest" and "be nice") cover most cases.
*If a suspended user decides to reveal information about their own suspension, the moderators may then be permitted to respond. But as a rule, we tend not to do so because we've found that it rarely leads to anything productive.