$text = '(ART)End Processing Autoroutines (12/06/15 15:50:47)'

# Regex = ^ Code:(.*?) Description:.* Timestamp:(.*?) $
$regex = [regex]::Match($text, '^\((?<code>.*?)\)(?<description>.*)\((?<timestamp>.*?)\)$')

$regex.Groups['code'].Value               # ART
$regex.Groups['description'].Value.Trim() # End Processing Autoroutines
$regex.Groups['timestamp'].Value          # 12/06/15 15:50:47