Complex sentence: After the takeover, PSA decided that the Linwood plant would be unprofitable to maintain and should be closed, which meant an end to both the Avenger and Sunbeam model lines, further emphasizing the need for a new supermini in the Talbot lineup.
Split into simpler sentences: After the takeover, PSA decided that the Linwood operations would be unprofitable to maintain and thus that the plant should be closed, which meant an end to both the Avenger and Sunbeam model lines. This further emphasized the need for a new supermini in the Talbot lineup.