Complex sentence: The first tank to be experimentally fitted with a floatation screen was a Tetrarch tank and its first trial took place in June 1941 in Brent Reservoir (also known as Hendon Reservoir) in North London in front of General Alan Brooke.
Split into simpler sentences: The first tank to be experimentally fitted with a flotation screen was a Tetrarch. Its first trial took place in June 1941 in Brent Reservoir (also known as Hendon Reservoir) in north London in front of General Alan Brooke.