Riaz Ahmed
He won a gold medal at the 1968 Summer Olympics in Mexico City , and a silver medal at the 1972 Summer Olympics in Munich . 
<triplet> 1968 Summer Olympics <subj> 1968 <obj> point in time <subj> Mexico City <obj> location <subj> 1972 Summer Olympics <obj> followed by <triplet> 1972 Summer Olympics <subj> 1968 Summer Olympics <obj> follows <subj> Munich <obj> location