Original sentence: This includes linking periodic comet 109P/Swift-Tuttle to Chinese comets seen in 69 BC and AD 188 , which helped confirm that the comet's motion was not greatly influenced by nongravitational effects, and linking periodic comet 104P/Kowal to a comet reported by the Reverend Leo Boethin (Philippines) in 1973, which helped confirm that its motion was greatly influenced by nongravitational effects
Edited sentence: This includes linking periodic comet 109P/Swift-Tuttle to Chinese comets seen in 69 BC and AD 188, which helped confirm that the comet's motion was not greatly influenced by nongravitational effects, and linking periodic comet 104P/Kowal to a comet reported by the Reverend Leo Boethin (Philippines) in 1973, which helped confirm that its motion was greatly influenced by nongravitational effects