The difficulty with this sentence is the use of: ....should....., so long as........ I think this structure does not make any sense here. Where did you read this line? And can you give the context?

参看我在“what‘s the difference between 'as long as' and 'so long as ?或许你能真正明白

Yes, you have it right, Jocelyn. In fact, "so long as" (or "as long as") is really just another way of saying "if." Here are some other examples: * You shouldn't make any mistakes so long as you follow the instructions. * We'll finish the project on time as long as everyone does his or her part. * We will go to the outdoor concert so long as it doesn't rain. * I suggest we adopt the proposal as long as everyone is comfortable with that. There is another meaning of "as/so long as," however, that refers to time. In this case, the "long" means "how long"; for example: * I won't buy a new car so long as this one is running well. In other words, for the length of time that my current car is running well I will not replace it. When that time ends, I will get a new car.