Final answer:
To make the sentence complex, add a dependent clause using a subordinating conjunction.
Step-by-step explanation:
This sentence can be made into a complex sentence by adding a dependent clause. A dependent clause begins with a subordinating conjunction and does not express a complete thought. Here is an example of how the sentence can be modified:
As soon as he came into her life, she immediately went in haste to give that news.
In this revised sentence, the subordinating conjunction 'As soon as' introduces the dependent clause 'he came into her life,' and the main clause 'she immediately went in haste to give that news' expresses the complete thought.