Preserving Discourse Structure when Simplifying Text Advaith Siddharthan author 2003-04 text Proceedings of the 9th European Workshop on Natural Language Generation (ENLG-2003) at EACL 2003 Ehud Reiter editor Helmut Horacek editor Kees van Deemter editor Association for Computational Linguistics Budapest, Hungary conference publication siddharthan-2003-preserving https://aclanthology.org/W03-2314/ 2003-04