Complex sentence: Braathens started a costly price war with its competitors Color Air and SAS; after Color Air went bankrupt in 1999, Braathens started terminating routes, and the Swedish division was merged into the subsidiary Malmö Aviation.
Split into simpler sentences: Braathens started a costly price war with its competitors Color Air and SAS. After Color Air went bankrupt in 1999, Braathens started terminating routes, and the Swedish division was merged into the subsidiary Malmö Aviation.