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

Candidate passages:
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. 
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"  
Matisse is an impact crater on the Southern hemisphere of Mercury.
Matisse takes its name from the French artist Henri Matisse. 
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. 
The Conversation, a painting by Henri Matisse dating from 1908–1912, depicts the artist and his wife facing each other before a background of intense blue.
It is in the collection of the Hermitage Museum in Saint Petersburg, Russia.
This was among several works acquired directly from Matisse in Paris by the Russian collector Sergei Shchukin.
After the Russian Revolution, the Shchukin collection was confiscated and, by 1948, was donated to the public along with the Ivan Morozov collection, at the Pushkin Museum of Fine Arts in Moscow and the Hermitage Museum in St Petersburg.
Matisse painted "The Conversation" at a time when he had abandoned the open, spontaneous brushwork of his Fauve period in favor of a flatter and more decorative style.
The painting is large (69 5/8 in.
x 85 3/8 in., or 177 cm x 217 cm), and shows Matisse in profile, standing at the left in striped pajamas, while his wife, Amélie, sits to the right.
The flatly painted blue wall behind them is relieved by a window opening onto a garden landscape.
Art historian Hilary Spurling has described this "stern encounter" as "portray the profound underlying shape or mechanism of a relationship laid down for both parties on the day, soon after they first met in 1897, when Matisse warned his future wife that, dearly as he loved her, he would always love painting more.
"The pajamas worn by Matisse were fashionable as leisure wear in early 20th century France.
They had recently been introduced to Europe from India, where they were worn by tea planters, and Matisse habitually thereafter wore pajamas as his studio working clothes.