Complex sentence: It was a tactic that had yielded him good results in the past and Barrientos hoped to rebuild his political capital but when flying into Arque, Cochabamba Department, he perished on April 27,1969, in a helicopter crash.
Split into simpler sentences: It was a tactic that had yielded him good results in the past and Barrientos hoped to rebuild his political capital. However, when flying into Arque, Cochabamba Department, he perished on April 27,1969, in a helicopter crash.