Cameron worked for this computer company for ten years and then he found a better-paid job.
Why is past simple used here?
Cameron worked for this computer company for ten years and then he found a better-paid job.
Why is past simple used here?
The simple past is preferred. We can still use the past perfect, but it is unnecessary as the sequence of events is clear: the finding happened after the working.
Presumably you mean "Why isn't the past perfect used, when one past incident happened before another?"
The simple past tense is fine when you are merely listing two things that happened. If the writer had wanted to emphasise the order of events, they could have said
Cameron had worked at the computer company for ten years before he found a better-paid job.