Complex sentence: In France, he is famous for a book of verse, "Les Contrerimes", published after he was dead, but many pieces of it were incorporated in his novels, or published in literary magazines, from 1910 to 1914.
Split into simpler sentences: In France, he is mostly famous for a book of verse, "Les Contrerimes" (Counterrimes). The book was published posthumously but many pieces had been incorporated in his novels or published in literary magazines from 1910 to 1914.