The first figure is the minimum of the scale and the last figure is the maximum.
There are two sets of figures inbetween, one set in brackets. The figures inbetween are the quantum of annual increments, and the figures in brackets say for how many years (or how many such increments would be applicable) before jumping into the next stage, of higher increments. This is the standard format for indicating a wage scale for unionized workmen and is not as commonly used for executives, except in government and Public sector organizations, where it is still prevalent.
Gerry