Here I try..

Facebook聯合創始人愛德華多•薩維林(Eduardo Saverin)的發言人稱，薩維林放棄美國國籍並不是因為對美國有任何不滿，隻是因為美國針對在海外持有資產的公民的規定太過複雜。

The speaker of Facebook co-founder Edurado Saverin says that Saverin gives up US citizenship is not because of his disaggrement/disapointment to US; only that the over-complicated rule to the oversea properties of citizen's.