It is a complex system, but it certainly makes a change.

这是个复杂系统，但肯定有所改进。

But this complex system soon will be a thing of the past.

不过，这种复杂的系统不久就会成为历史。

You do not need to understand a complex system of betting, as in craps.

你不需要懂复杂的赌注系统，比如掷骰子。

We have an incredibly complex system with only the most rudimentary controls.

我们有一个不可想象的复杂系统，而只是最低标准的控制。

A model simplifies a complex system by exposing only some aspects of the system.

模型通过只公开系统的某些特定方面来简化复杂的系统。