Roald Bradstock
He twice represented Great Britain at the Summer Olympics: 1984 and 1988 . 
<triplet> Summer Olympics <subj> 1984 <obj> has part <subj> 1988 <obj> has part <triplet> 1984 <subj> Summer Olympics <obj> instance of <subj> 1984 <obj> point in time <triplet> 1988 <subj> Summer Olympics <obj> instance of