Complex sentence: After reaching the top of a long waiting list, there is a real possibility of being blackballed; the proposer of such a person is expected to resign, as he failed to withdraw his undesirable candidate.
Split into simpler sentences: After reaching the top of a long waiting list, there is a possibility of being blackballed. In these circumstances, the proposer of such a person may be expected to resign, as he failed to withdraw his undesirable candidate.