使用以下输入的两个片段，合并它们以创建完整的句子，同时确保句子的结构通畅、流畅。

The company is planning to launch a new product line next month.
2. 输入：The advertising campaign for the new product line has already started.
The company has already started the advertising campaign for its new product line, which is planned to be launched next month.