Original sentence: 6 million tourists including 750,000 foreigners per year visit Gyeongju.It boasts the 1000 years of Silla heritage with vast number of ancient ruins and archaeological sites found throughout the city
Edited sentence: It boasts the 1000 years of Silla heritage with vast number of ancient ruins and archaeological sites found throughout the city, which help to attract 6 million visiting tourists including 750,000 foreigners per year