'extensively-structured' originates from the combination of 'extensive' and 'structured'. 'Extensive' comes from Latin 'extensus', meaning 'stretched out', and 'structured' comes from Latin 'structura', meaning 'a fitting together, building'.

'Extensive' evolved from the Latin 'extensus' through Old French 'extensif', and 'structured' evolved from Latin 'structura' through Old French 'structure'.

Initially, 'extensive' meant 'stretched out' and 'structured' meant 'a fitting together'. Over time, they combined to describe something organized in a detailed manner.