Question: When did Henri Matisse and his wife separate?
About the article "Henri Matisse", section "The war years".

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The Green Stripe ("La Raie Verte"), also known as Portrait of Madame Matisse.
The Green Line, is a portrait by Henri Matisse of his wife, Amélie Noellie Matisse-Parayre.
He painted it in 1905, just prior to such works being derisively labeled as the creations of Les Fauves (the wild beasts), along with similar works of André Derain and Maurice de Vlaminck.
The painting hangs in Statens Museum for Kunst in Copenhagen, Denmark. 
Young Marg was highly influenced by Henri Matisse’s modern art, which included bright pieces that captured her attention.
From 1907 to 1908 Marg studied at Studied at Academie Matisse, Paris and founded the Matisse School in Paris with her husband Oskar Moll in 1908 to educate and promote the modernist aesthetics in arts that including Matisse’s form of art.
In 1908, Marg and her husband met Henri Matisse.
In the same year, Matisse painted his famous portrait of Greta Moll, Located in the National Gallery in London.
When Marg began to work with Matisse she concentrated more heavily on sculpture, perfecting his technique and using all sorts of sculpting materials. 
Alexina "Teeny" Duchamp (January 6, 1906 – December 20, 1995) was the wife of Pierre Matisse, son of artist Henri Matisse, and second wife of artist and chess player Marcel Duchamp. 
Matisse may refer to: Henri Matisse (1869–1954), French artist Pierre Matisse (1900–1989), French-American art dealer, son of Henri Matisse Paul Matisse (born 1933), American artist and inventor, son of Pierre Matisse, grandson of Henri Matisse Matisse (singer) (born 1985), American actress, model, singer and songwriter, one half of the former Brit & Alex Matisse (crater), a crater on Mercury named after Henri Matisse Matisse (band), an alternative rock band from Athens, Greece, named after Henri Matisse Matisse GUI builder project; see Netbeans.
Matisse ITC, a typeface owned by the International Typeface Corporation Matilda Matisse, a character from the Japanese manga series "Shaman King"  
Sophie's father is the sculptor and inventor Paul Matisse, a Harvard graduate.
Her grandfather, Paul's father, was the distinguished Modern art dealer Pierre Matisse, who'd moved to America in the 1920s.
Pierre was the youngest child of prominent 20th century painter Henri Matisse, Sophie's great-grandfather.
Henri Matisse died in 1954, aged 85, eleven years before Sophie's birth.
Family members expressed concern as to Sophie's use of the "Matisse" name, and in her youth she was discouraged from admitting to be a descendent of her famous great-grandfather.
Only by incidentally noticing her family name on museum walls did Sophie come to consider that her great-grandfather may have been someone "exceptional.
"Sophie Matisse's step-grandfather was the artist Marcel Duchamp, who famously reinterpreted Leonardo da Vinci's "Mona Lisa" by adding a mustache.
Duchamp married Sophie's grandmother Alexina "Teeny" Matisse, an American, in 1954 after she and Pierre Matisse divorced.
Sophie has cited Duchamp as an influence, once saying "his presence stopped me from getting too serious.
"Art writers have pointed to the "visual jokes" sometimes apparent in Sophie's own work as a sign of Duchamp's influence.
Sophie Matisse is represented by Francis Naumann Fine Art, LLC, in New York City.