plan可以后接that从句作宾语。当主语为泛指的they时，句子可以改为被动语态。例如：

They plan that the Tesla K20 will be available in the fourth quarter of 2012. (plan后接that从句，正式语体用虚拟语气，非正式语体可用陈述语气。本句为陈述语气）。这个句子可改为被动语态如下：

It is planned that the Tesla K20 will be available in the fourth quarter of 2012.

这个句子中that从句是宾语从句， the Tesla K20是宾语从句的主语。可以把that从句的主语提升到主句中作主语，同时把that从句的谓语动词改为to do不定式结构，句子就变成了一个简单句：

The Tesla K20 is planned to be available in the fourth quarter of 2012.

此时有二种分析方法：第一，把to be...不定式分析为主语补足语。第二，把 is planned to be分析为复合谓语。

再看一个例子：

It seems that Tom has missed the last bus. Tom是that从句的主语。把Tom提升到主句作主语，得到：

Tom seems to have missed the last bus. 这种结构称为提升主语结构（raised subject)。即that从句的主语提升到主句作主语，that从句的谓语动词改为to do不定式。

你的句子就是提升主语结构。