Given the task definition and input, reply with output. In this task, given a sentence in the Chinese language, your task is to convert it into the English language.

这之后，他们开始着手评估2003年和2004年之间的变动；包括试图将公开已知的事件与指南的改动相关联。

Following this, they set out to assess what had changed between 2003 and 2004; including attempts to link publicly known incidents with changes to the manual.