First, you've used hard to reference table names and a 1-1 relationship is pointless so let's just say you have 1 table right now: tblParticipants. ([T_Randomization Data] hasn't come into play yet, so we will disregard that for now.)
When you break out your data as I prescribed into tblConsents that creates a 1 to many relationship with tblPArticipants. Formwise, those relationships are handled via Form/SubForm. tblPArticipants would be the basis for the main form, and tblConsents would be the basis for the sub-form. The main form would show just 1 record of data from tblParticipants, the subform would show all records in tblConsents for that record in Partcipant. It would be a continous form--just record after record vertically, with the last record spot being blank so that you could enter new consent data to that participant.
When you break out your data as I prescribed into tblConsents that creates a 1 to many relationship with tblPArticipants. Formwise, those relationships are handled via Form/SubForm. tblPArticipants would be the basis for the main form, and tblConsents would be the basis for the sub-form. The main form would show just 1 record of data from tblParticipants, the subform would show all records in tblConsents for that record in Partcipant. It would be a continous form--just record after record vertically, with the last record spot being blank so that you could enter new consent data to that participant.