'sporadically-divided' originates from the combination of 'sporadic' and 'divide', where 'sporadic' comes from the Greek word 'sporadikos', meaning 'scattered', and 'divide' from the Latin 'dividere', meaning 'to separate'.

'sporadic' changed from the Greek word 'sporadikos' to the modern English word 'sporadic', and 'divide' evolved from the Latin 'dividere' to the modern English 'divide'.

Initially, 'sporadic' meant 'scattered or dispersed', and 'divide' meant 'to separate', which together evolved into the meaning of 'divided in an irregular manner'.