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I found the statement of question on page 346 in the book "Electric Machinery Fundamentals, fifth edition" written by Stephen J. Chapman.

When I searched for how duplex lap winding looks like, I found the figure in this link: https://circuitglobe.com/lap-and-wave-winding.html#:~:text=The%20duplex%20lap%20winding%20is,number%20to%20the%20second%20winding, which is also cited in this thread: DC motor armature rewinding.

However, it seems to me the figure shows that the number of current path is the same as the simplex lap winding but with twice the length of current path. Why the number of current paths in a DC electric machine is m * P, where m means m-plex, P is the number of poles on the machine?

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