Complex sentence: Recent issues of the BHS publication have carrie articals on the contraversial Rollkur (otherwise known as LDR or Hyperflection) debate, when the BHS received letters of complaint from its membership.
Split into simpler sentences: Recent issues of a BHS publication have carried articles on the controversial Rollkur procedure (otherwise known as LDR or Hyperflection) debate. The BHS received letters of complaint from its membership.