Complex sentence: While Line 1 goes straight through the city center, this line follows the Inner Ring Road around the city and shares the part between Baoshan Road and Hongqiao Road with Line 4.
Split into simpler sentences: While Line 1 goes straight through the city center, this line follows the Inner Ring Road around the city. This line shares the part between Baoshan Road and Hongqiao Road with the Line 4.