？
How can we get back to our time?
Literal
We-[plural-達] [attributive-の] era [to-に] return [in-order-to-には] how do-[if-たら] good [question-の]?
A time-travel scenario question. ~には ('in order to, for the purpose of') marks the goal. どうやったらいい is a very common fixed question pattern meaning 'what should I do, how should I go about X' — literally 'how if I do will it be good.' The の at the end is the explanatory/interrogative nominalizer used in casual spoken questions.