It all depends on what "complicated" means to you. SH and sea maneuvers and navigation in general are not
complicated. As long as you're willing to put a bit of effort into understanding them, there's tons of material you can read, they're very enjoyable and they make a lot more sense than most things you're forced to do in your life.
SH as a series is not a SIM, you don't need to work in the navy to understand it. This is a slow paced game where the main joy is to understand the big picture while being cramped inside a metal box with 2 peepholes, only using lines and angles. It's not unlike figuring out where you are in the world just by using a battery-free sextant, a clock and a star chart. It's not instant, but it's a well documented easy to follow procedure and it's very enjoyable.
SH5 however, although advertised as a friendly game for beginners is anything but (I;m not even talking about bugs here). A beginner relies on easy to read information and easy control. The game by default offers none. It's like playing a FPS without strafe buttons and without your weapons and ammo showing. I suggest you stay out for a while and get better at SH3 or SH4. Then see how the weather's like on the SH5 section
