Use a limit of 2, then slice starting from the second element.

a = "This is just an example";
console.log(a.split(" ", 2).slice(1));

Or split the string with a limit of 2, then use an array literal containing just the second element.

a = "This is just an example";
console.log([a.split(" ", 2)[1]]);

A Better Approach would be to split on a space & that will give you an array of string, select the index you want & split it further

Note : ARRAY INDEX STARTS FROM 0 NOT ONE, SO IF YOU WANT THE SECOND STRING, YOU WILL HAVE TO USE THE INDEX 1, NOT 2

const  a = "This is just an example";
const secondWordArr = a.split(' ')[1].split('');
// secondWordArr represents the array of characters of the seconds word
console.log(secondWordArr); // Output [ 'i', 's' ]

Explanation :

a.split(' ')  // this splits the string into an array of strings/words
a.split(' ')[1] // Access the second string in the array of split strings/words
a.split(' ')[1].split('') // splits the second string from the array of strings/words into a separate array//