Complex sentence: Like the similar Alexanderson alternator one of the first radio transmitters capable of generating continuous waves, it was used for long distance wireless telegraphy until the end of the 1920s when it was made obsolete by vacuum tube transmitters.
Split into simpler sentences: Like the similar Alexanderson alternator, it was one of the first radio transmitters capable of generating continuous waves. It was used for long distance wireless telegraphy until the end of the 1920s when it was made obsolete by vacuum tube transmitters.