if I interpret:
The Teprogrenaian Consensus and the Unified Republic of Darya pay 0.25

to the Veolian Commonwealth per

sold to the Hiocan Society for the construction of Planetary Defence Grids.
as:
If the Teprogrenaian Consensus sells a

to the Hiocan Society for the construction of Planetary Defence Grids the Teprogrenaian Consensus pays 0.25

per capital ship sold to the Veolian Comonwealth.
And if the Unified Republic of Darya sells a

to the Hiocan Society for the construction of Planetary Defence Grids the Unified Republic of Darya pays 0.25

per capital ship sold to the Veolian Comonwealth.
Then The Unified Republic of Darya votes 'Yes'. As that sentence seems a bit ambiguous I wish to make it more explicit.