Complex sentence: It was a first attempt towards the faster monoplane types that had less drag due to their double wings while the monoplanes could arrive to speeds around the 200 knots, that was considered in those days as an advantage against the slower bombers.
Split into simpler sentences: It was a first attempt towards the faster monoplane types that had less drag due to their double wings. While the monoplanes could arrive to speeds up to 200 knots, that was considered in those days to be an advantage against the slower bombers.