Complex sentence: German fans in 2006, exhilarated by their team's three previous victories in the World Cup, adopted rival songs such as "We're Heading For Berlin Without England" when supporters of both teams staged impromptu chanting competitions in the center of Cologne.
Split into simpler sentences: German fans in 2006, exhilarated by their team's three previous victories in the World Cup, adopted rival songs. When supporters of both teams staged impromptu chanting competitions in the center of Cologne.