Docs can you explain what is "complex partial seizures with secondary generalization"?

Confusing: A seizure can start from a specific spot or focus in the brain. This is referred to as being a partial seizure. If it involves an alteration in consciousness, it is considered as complex. It is progresses to a full body convulsion, it is generalized in a secondary manner. These terms are best defined by eeg monitoring during a seizure and careful observation and description of the seizure.