Complex sentence: The International Energy Agency shows how Venezuela's oil production has fallen in the last years, producing only daily, down from 3.5 million in 1998, but with the recent currency devaluation the oil incomes will double its value in local currency.
Split into simpler sentences: The International Energy Agency shows how Venezuela's oil production has fallen in the last years, producing only daily, down from 3.5 million in 1998. However, with the recent currency devaluation the oil incomes will double its value in local currency.