重返 is more literary and formal than 回到 (huídào, go back to). It emphasizes a significant or dramatic return after a notable absence. Common in news, sports, and formal writing.
mistakes
The 重 here is chóng (2nd tone, 'again'), not zhòng (4th tone, 'heavy'). A useful rule: 重 meaning 'again/repeat' is chóng; meaning 'heavy/important' is zhòng.