'jointly-organized' originates from the combination of 'jointly' and 'organized', where 'jointly' means 'together' and 'organized' means 'arranged in a systematic way'.

'jointly' and 'organized' have been used separately in English for centuries, but their combination into 'jointly-organized' is a more modern usage to describe collaborative efforts.

Initially, 'jointly' and 'organized' were used separately, but over time, their combination has come to specifically denote collaborative planning or arrangement.