Can anyone explain me how and what modernism do to create a very different and new form of poetry?

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Here is a simple explanation,

Modernist poetry refers to poetry written between 1890 and 1950 in the tradition of modernist literature in the English language, but the dates of the term depend upon a number of factors, including the nation of origin, the particular school in question, and the biases of the critic setting the dates. It is usually said to have begun with the French Symbolist movement and it artificially ends with the Second World War. The beginning and ending of the modernist period are of course arbitrary: poets like Yeats and Rilke started in a post-Romantic, Symbolist vein and modernised their poetic idiom under the impact of political and literary developments; other poets, like T.S. Eliot, Ezra Pound, or E.E. Cummings went on to produce significant work after World War II.