Complex sentence: Varoufakis is the author of several books on the European debt crisis, the financial unbalanced in the world, the game theory, is also a recognised speaker and often appears as analyst for national news media.
Split into simpler sentences: Varoufakis is the author of several books on the European debt crisis, the financial unbalanced in the world and the game theory. He is also a recognised speaker and often appears as analyst for national news media.