Complex sentence: In December 2009, during a match between Osasuna and Mallorca, Aouate was subjected to antisemitic chants coming from the Navarrese supporters--additionally, they waved Palestinian flags and called him "a murderer".
Split into simpler sentences: In December 2009, during a match between Osasuna and Mallorca, Aouate was subjected to antisemitic chants coming from the Navarrese supporters. Additionally, they waved Palestinian flags and called him "a murderer".