original: Serpent is a symmetric key block cipher which was a finalist in the Advanced Encryption Standard (AES) contest, where it came second to Rijndael.
simplifications: Serpent is a symmetric key block cipher which was a finalist in the Advanced Encryption Standard (AES) contest.  It came in second to Rijndael. Serpent is a cipher which came second to Rijndael at AES contest. Serpent is a symmetric key block cipher. It was a finalist in the Advanced Encryption Standard (AES) contest. It came in second. Serpent is a symmetric key block cipher. It was a finalist in the Advanced Encryption Standard (AES) contest, where it came second to Rijndael. Serpent is a symmetric key block cipher. It was a finalist in the Advanced Encryption Standard (AES) contest. It came second to Rijndael. Serpent is a method for encrypting data. It won second place in the Advanced Encryption Standard contest. Serpent is a symmetric key block cipher. It was second place in the Advanced Encryption Standard contest. Rijndael won first place. Serpent is a symmetric key block cipher, and the runner-up to Rijndael in the Advanced Encryption Standard (AES) contest. Serpent is a symmetric key block cipher. It came second to Rijndael in the AES contest. Serpent is a symmetric key block riddle that was a finalist in the Advanced Encryption Standard (AES) contest, where Rijndael was second.