(Power Query) Remove text from second set of brackets onwards

let
    test = #table(type table [test = text], {{"john (jack) smith (transport)"}, {"john (jack) smith"}}),
    tx = Table.AddColumn(
        test, 
        "transformed", 
        (x) => if Text.EndsWith(x[test], ")") 
            then Splitter.SplitTextByEachDelimiter({" ("}, QuoteStyle.None, true)(x[test]){0} 
            else x[test]
    )
in
    tx

let
    Source = Excel.CurrentWorkbook(){[Name="Table1"]}[Content],
    result = Table.TransformColumns(Source,{{"Description", each  if Text.End(_,1) =")" then Text.BeforeDelimiter(_,"(",{0,RelativePosition.FromEnd}) else _}})
in
    result