It seems like you have a series of sentences with missing words that pertain to various artists and art movements. I'll fill in the blanks for you:
A key feature of Modigliani’s work was flowing use of line.
The Vienna Secession was an important center for the development of the more general movement called Art Nouveau.
Kandinsky saw life and spirit in all things in nature.
Modigliani was fascinated with primitive art, especially African sculpture.
Henri Rousseau was dubbed Le Douanier because he had a long civil service career as a customs officer.
As a founder of the Nabis group, Pierre Bonnard declared himself the last of the Nabis.
Utrillo’s Marizy Sainte-Genevieve represents Utrillo’s early period.
I hope this helped!
~~~Harsha~~~