Complex sentence: Retired Aeronautical Engineer Don Jordan is widely agreed to be the inventor of what are now known as series drogues; however, before his invention, numerous mariners had experimented with pulling several large drogues in series.
Split into simpler sentences: Retired Aeronautical Engineer Don Jordan is widely agreed to be the inventor of what are now known as series drogues. However, before his invention, numerous mariners had experimented with pulling several large drogues in series.