Complex sentence: There are no obvious biblical evidence that Peter was ever in Rome, but he does mention that "The church that is at Babylon, elected together with you, saluteth you; and so doth Marcus my son" (1 Peter 5:13).
Split into simpler sentences: There are no obvious biblical evidence that Peter was ever in Rome. He does mention that "The church that is at Babylon, elected together with you, saluteth you; and so doth Marcus my son" (1 Peter 5:13).