Complex sentence: Many were first serialized in the "New York Weekly" "storypaper"; the popularity of her novel "Marian Grey" (1863) reportedly led to a jump in the paper's circulation by 50,000 and it reached 100,000 by 1865.
Split into simpler sentences: Many were first serialized in the "New York Weekly" "storypaper". The popularity of her novel "Marian Grey" (1863) reportedly led to a jump in the paper's circulation by 50,000, and it reached 100,000 by 1865.