I don't see what is hard to understand about it.
There is the timeline of the Kuuga through Kiva tv shows, that now includes the first world we saw on Decade.
Then there are nine alternate timelines that are similar but vastly different.
This years bad guy is causing the alternate timelines to merge with the original.
Decade is leaves the original timeline to protect the alternate timelines from their badguys, he prevents the merger, regains the power that was lost to him, and gains allies.
While Decade is doing that the Riders of the original timeline are preventing the alternate timelines from merging with the original timeline.
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