Complex sentence: In March 2014 the editorship was taken over by David P. Berschauer and David B. Waller, who become co-editors, and the journal was changed in both format and scope.
Split into simpler sentences: In March 2014 the editorship was taken over by David P. Berschauer and David B. Waller, who become co-editors. The journal was changed in both format and scope.