Complex sentence: During the Balkan Wars of 1912-1913 Berchtold mooted with the idea of war with Serbia; having ruled this out he nonetheless accepted what amounted to a diplomatic defeat at the conclusion of the war.
Split into simpler sentences: During the Balkan Wars of 1912-1913 Berchtold mooted the idea of war with Serbia. Having ruled this out he nonetheless accepted what amounted to a diplomatic defeat at the conclusion of the war.