English is a relatively uninflected language, so word order is important. In declarative sentences, for example, we put the subject first most of the time, and the verb after it. It can get tricky when we insert modifiers. The rule is to put modifiers as close to what they modify as possible. Here’s an example of breaking this rule:
After President George W. Bush announced a plan to return to the Moon and move on to Mars in 2004, NASA began to consider how best to carry out that vision.
We moved to Mars in 2004? What is this, science fiction? I suppose the likelihood that most readers would know that we’re not on Mars yet would make them think a bit to figure out what did happen that year. But as a writer you want the information to flow into your readers’ brains effortlessly. So put that date where it goes, at the beginning:
In 2004, after President George W. Bush announced a plan to return to the Moon and move on to Mars, NASA began to consider how best to carry out that vision.
Now the readers can tell exactly what the writer means without having to interrupt themselves to figure out what’s going on.