Complex sentence: In 1912, he composed "Requiem" for men's chorus on the same poem as the final part of his Op.83, and in 1914 he began composing a setting of the Latin Requiem in memory of the victims of the war.
Split into simpler sentences: In 1912, he composed "Requiem" for men's chorus on the same poem, as the final part of his. In 1914 he began composing a setting of the Latin Requiem in memory of the victims of the war.