how to break string into 2 words [duplicate]

string : The effect of leadership on work motivation

how to make the string to be like this:

Arrays
(
     [0] => The effect
     [1] => effect of
     [2] => of leadership
     [3] => leadership on
     [4] => on work
     [5] => work motivation
)

source https://stackoverflow.com/questions/76191979/how-to-break-string-into-2-words