Complex sentence: IDNA performs some significant pre and post processing in addition to its use of punycode, for further information on IDNA including the pre and post-processing and the spoofing concerns see the Internationalized domain name article.
Split into simpler sentences: IDNA performs some significant pre- and post-processing in addition to its use of Punycode. For further information on IDNA including the pre and post-processing and the spoofing concerns see the Internationalized domain name article.