Complex sentence: Big Bang performed in Hong Kong and England in December 2012 before concluding the tour with concerts in Osaka on January 12 and 13 and a three night stint at the Olympic Gymnastics Arena in Seoul on January 25,26, and 27,2013.
Split into simpler sentences: Big Bang performed in Hong Kong and England in December 2012. The group concluded the tour with concerts in Osaka on January 12 and 13 and a three night stint at the Olympic Gymnastics Arena in Seoul on January 25,26, and 27,2013.