Conditional permanent resident will be terminated within 2 years the CPR is granted if the marriage is terminated through divorce. For this purpose, legal seperation is not considered continuous existance of the marriage. Therefore, you may have a problem in this case.Your PR may be subject to be terminated.
However, you can still ask for a waiver for termination by proving that your marriage was entered in good faith and was not for purpose of immigration. To prove this point, any evidence including joint bank account before seperations, joint tenancy, bills under hu*****and and wife's names will be helpful. If you have a kid, it will give you a stronger case.
Good luck!