source: The team remained in Phoenix until the MLB expanded in 1998 with the Diamondbacks, which forced a move of the former Seals franchise.
target: The Seals were based in Phoenix. The team left when the MLB expanded in 1998 with the Diamondbacks. The Seals were forced to move.
references: The Seals were based in Phoenix. The team left when the MLB expanded in 1998 with the Diamondbacks. The Seals were forced to move.