Original sentence: The Situationist International (SI), a small group of international political and artistic agitators with roots in Marxism, Lettrism and the early 20th century European artistic and political avant-gardes formed in 1957, aspired to major social and political transformations; before disbanding in 1972 and splitting into a number of different groups, including the Situationist Bauhaus, the Antinational, and the Second Situationist International, the first SI became active in Europe through the 1960s and elsewhere throughout the world and was characterized by an anti-capitalist and surrealist perspective on aesthetics and politics, according to Italian art historian Francesco Poli
Edited sentence: The Situationist International (SI), a small group of international political and artistic agitators with roots in Marxism, Lettrism and the early 20th-century European artistic and political avant-gardes formed in 1957, aspired to major social and political transformations; before disbanding in 1972 and splitting into a number of different groups, including the Situationist Bauhaus, the Antinational, and the Second Situationist International, the first SI became active in Europe through the 1960s and elsewhere throughout the world and was characterized by an anti-capitalist and surrealist perspective on aesthetics and politics, according to Italian art historian Francesco Poli