Complex sentence: He said that it is difficult to determine where the line should be drawn between what is too much surveillance and how much is needed for national security because technology is ever changing and evolving, therefore, the laws cannot keep up with the rapid advancements.
Split into simpler sentences: He said that it is difficult to determine where the line should be drawn between what is too much surveillance and how much is needed for national security because technology is ever changing and evolving. Therefore, the laws cannot keep up with the rapid advancements.