Complex sentence: The event marked a major turning point in the history of the lesbian, gay, bisexual and transgender community in Canada; the raids and their aftermath are today widely considered to be the Canadian equivalent of the 1969 Stonewall riots in New York City.
Split into simpler sentences: The event marked a major turning point in the history of the lesbian, gay, bisexual and transgender community in Canada. The raids and their aftermath are today widely considered to be the Canadian equivalent of the 1969 Stonewall riots in New York City.