Complex sentence: As a player, Manikas was a goalkeeper who spent the majority of his career with Panionios, but also played for Levadiakos, Ethnikos Piraeus, and Kallithea.
Split into simpler sentences: As a player, Manikas was a goalkeeper. He spent the majority of his career with Panionios, but also played for Levadiakos, Ethnikos Piraeus, and Kallithea.