眼下更多有关令人非常失望的欧洲峰会新闻内容(议题)将在稍后播报.
主语More;
动词 will be broadcast;
时间状语:later
More will be broadcast (=brought to you) later.
More后的介词引导的定语短语.
what will now be a highly disappointing European summit 是一个介词ON 的宾语从句.
简化后,本句话可为:
More on European summit will be broadcast later.