首先纠正 redeiving 应为 receiving
在这个句子中：
That it was Dr.Carrkky,the former pupil of Dr.Fitzbody who was receiving this lifetime award before his mentor 是主语.是that引导的主语从句.中心主句为 that was only minor (那是次要的)
而 这个从句是个强调句型 it was + 强调部分（Dr.Carrkky）+ 其它（ who was receiving this lifetime award before his mentor）
注意 who 就是 强调句型的 那个 that!
the former pupil of Dr.Fitzbody 是Dr.Carrkky 的同位语.
所以这句话译成：在自己的导师之前接受终生奖的是Carrkky博士,即Fitzbody博士以前的学生,这事是次要的.