Complex sentence: Several publications by charity, religious, and labor organizations tried to draw attention to the homeless in the late 19th and early 20th centuries, but the street newspapers only became common after the founding of New York City's "Street News" in 1989.
Split into simpler sentences: Several publications by charity, religious, and labor organizations tried to draw attention to the homeless in the late 19th and early 20th centuries. Not until the 1990s did modern street newspapers become common, after the founding of New York City's "Street News" in 1989.