Complex sentence: Johnson was heavily involved in the Stonewall uprising in 1969 and later became a popular figure in New York City's gay and art scene and was hailed "the mayor of Christopher Street", the site of Stonewall.
Split into simpler sentences: Johnson was heavily involved in the Stonewall uprising in 1969. Johnson became a popular figure in New York City's gay and art scene and was hailed "the mayor of Christopher Street", the site of Stonewall.