  One of the necessary extensions to the centering model is a mechanism to
handle pronouns with intrasentential antecedents. Existing centering models
deal only with discourses consisting of simple sentences. It leaves unclear how
to delimit center-updating utterance units and how to process complex
utterances consisting of multiple clauses. In this paper, I will explore the
extent to which a straightforward extension of an existing intersentential
centering model contributes to this effect. I will motivate an approach that
breaks a complex sentence into a hierarchy of center-updating units and
proposes the preferred interpretation of a pronoun in its local context
arbitrarily deep in the given sentence structure. This approach will be
substantiated with examples from naturally occurring written discourses.
