Complex sentence: In 1379 the Navarrese Company at service of the Emperor Jacques de Baux conquered Thebes and part of Neopatria, while the Catalans kept another part of Neopatria and Attica.
Split into simpler sentences: In 1379 the Navarrese Company at service of the Emperor Jacques de Baux conquered Thebes and part of Neopatria. Meanwhile, the Catalans kept another part of Neopatria and Attica.