TASK DEFINITION: In this task, we ask you to elaborate the sentence without changing its general meaning. You can do so by explaining further the input sentence, using more precise wording, adding qualifiers and auxiliary information etc.
PROBLEM: It was a major event in the history of public health , and the founding event of the science of epidemiology .

SOLUTION: This has been perceived as a major event in the history of public health and regarded as the founding event of the science of epidemiology , having helped shape public health policies around the world .

PROBLEM: The song was Jackson 's fifth # 1 single on the " Billboard " Hot 100 .

SOLUTION: The song became Jackson 's fifth number-one single on the " Billboard " Hot 100 , and the final of seven top five singles from the album , making her the only artist to achieve seven top five singles from one album .

PROBLEM: American Airlines Flight 191 was a scheduled commercial flight from O 'Hare International Airport in Chicago to Los Angeles International Airport .

SOLUTION:
American Airlines Flight 191 was a regularly scheduled passenger flight operated by American Airlines from O 'Hare International Airport in Chicago , Illinois , to Los Angeles International Airport in Los Angeles , California .