Complex sentence: The interstate rivalry was interrupted again when Nashville moved to the Triple-A American Association in 1985, but was renewed in 1998 when the Sounds joined the Triple-A Pacific Coast League and the Memphis Redbirds were created as a PCL expansion team.
Split into simpler sentences: The interstate rivalry was interrupted again when the Sounds moved to the Triple-A American Association in 1985. The rivalry was renewed in 1998 when the Sounds joined the Triple-A Pacific Coast League and the Memphis Redbirds were created as a PCL expansion team.