Complex sentence: In Morse code, prosigns or procedural signals are dot/dash sequences that do not represent alpha numeric or punctuation message text characters "per se", but are Morse code symbols that have a special meaning in a transmission.
Split into simpler sentences: In Morse code, prosigns or procedural signals are dot/dash sequences that do not represent alpha-numeric or punctuation message text characters "per se". Instead, prosigns are special Morse code symbols that have a particular meaning in a transmission.