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Here you go :)

let originalArr = [
    {
      "a": "2",
      "ss": [
        {
          "name": "pourush",
          "age": "25"
        },
        {
          "name": "Mak",
          "age": "25"
        }
      ]
    },
     {
      "b": "3",
      "ss": [
        {
          "name": "James",
          "age": "19"
        },
        {
          "name": "shaun",
          "age": "20"
        }
      ]
    }
  ];

let newArr = [];
for (let i in originalArr) {
    for (let j in originalArr[i].ss) {
        newArr.push(originalArr[i].ss[j]);
    }
}
//test it out:
console.log(newArr);