It's good, Antono1986 One minor grammar mistake though, but the sentense makes perfect sense. It's just that you're trying too hard if you know what I mean. You're a businessman, right? I thought it's kind of like that in business - less words - more information. Like we Russians say: "Всё гениальное - просто".

So I just suggest to come up with a less cumbersome sentence but still the one that conveys your thoughts clearly. Kind of like this:

Эти индивидуальные пенсионные планы достаточно просты, но несмотря на это, (всё-таки) невозможно полностью/досканально разобраться/разбираться во всех его малейших/незначительных деталях