1. After the 2015 season , Seoul FC Martyrs left the league , but three new teams Buyeo FC , Siheung Citizen and Yangpyeong FC joined the league .
2. After 2015 season Seoul FC Martyrs left the league , but three new teams Buyeo FC , Siheung Citizen , and Yangpyeong FC joined it .

Are these two sentences paraphrases of each other?
yes