'improperly-split' originates from the combination of 'improperly' and 'split', where 'improperly' means 'not in accordance with accepted standards' and 'split' means 'to divide or separate'.

'improperly-split' combines the adverb 'improperly' with the verb 'split', forming an adjective to describe something divided incorrectly.

Initially, 'improperly' meant 'not proper', and 'split' meant 'to divide'. Together, they describe an incorrect division.