Complex sentence: Milch resigned from the military in 1920 to pursue a career in civil aviation, and with squadron colleague Gotthard Sachsenberg, formed a small airline in Danzig under the banner of "Lloyd Luftdienst", "Norddeutscher Lloyd" s union of regional German airlines.
Split into simpler sentences: Milch resigned from the military in 1920 to pursue a career in civil aviation. With squadron colleague Gotthard Sachsenberg, Milch formed a small airline in Danzig under the banner of "Lloyd Luftdienst", "Norddeutscher Lloyd" s union of regional German airlines.