<<< native
[ EDelimited
    "("
    ")"
    [ Right (EFraction NormalFrac (EIdentifier "y") (EIdentifier "z"))
    ]
, ESymbol Bin "+"
, EDelimited
    "("
    ")"
    [ Right (EFraction NormalFrac (EIdentifier "y") (EIdentifier "z"))
    ]
]
>>> tex
\left( \frac{y}{z} \right) + \left( \frac{y}{z} \right)