hi. I was wondering if this is a good concrete detail.

Question

After the fall of the Soviet Union, the leaders of 11 of the 15 constituent republics of the Soviet Union met in Alma-Ata, Kazakhstan, and signed the Charter of the Commonwealth of Independent States, thus de facto ratifying the initial CIS Treaty.

is there any other way to rewrite this sentence?

thanks in advance!

Yes, there are many ways to rewrite this sentence....including making it into two sentences.

The CIS Treaty was de facto ratified after the collapse of the Soviet Union when.....

Yes, it is concrete detail presented.