On estimating the purchase money or compensation to be paid by the promoters of the undertaking in any of the cases aforesaid, the sheriff, arbiters, valuator, or jury, as the case may be, shall apportion the said compensation among the parties who may be interested in the said lands as joint owners or lessees, or as holding some security or burden or claim thereon or interest therein, and who shall have been parties to the said trial or arbitration or valuation: Provided always, that nothing herein contained shall prevent any person having a separate interest from having the same separately tried.