Complex sentence: In the UK, Band I was originally used for monochrome 405-line television; likewise, the French monochrome 819-line system used Band I. These two systems were booth discontinued in the mid 1980s.
Split into simpler sentences: In the UK, Band I was originally used for monochrome 405-line television. Likewise, the French 819-line system used Band I. However this system was discontinued in the mid 1980s.