Complex sentence: They have qualified for three consecutive World Cups, first in Germany in 2006, then South Africa in 2010 and finally Brazil in 2014, in all three case they failed to move beyond the group stage.
Split into simpler sentences: They have qualified for three consecutive World Cups, first in Germany in 2006, then South Africa in 2010 and finally Brazil in 2014. In all three cases they failed to move beyond the group stage.