Complex sentence: The Sud-Est SE-3110 or SNCASE SE-3110 was a French two seat experimental helicopter with unusual twin, angled tail rotors, first flown in 1950.After brief tests SNCASE decided to concentrate on a closely related but single tail rotor design.
Split into simpler sentences: The Sud-Est SE-3110 or SNCASE SE-3110 was a French two seat experimental helicopter first flown in 1950. It had unusual twin, angled tail rotors but SNCASE rapidly decided to concentrate on a closely related but single tail rotor design.