Bitcoin was like a single entity before it was later separated into 2 separate block chains in 2017; the original Bitcoin and the Bitcoin cash.
Bitcoin is still only a single entity, others that claims to be Bitcoin are altcoins, bitcoin cash is a hardfork of Bitcoin.
At the said time, the Bitcoin community tried to determine how it can improve it's networks ability to process more transactions at the same time.
Use Bitcoin cash community if what you meant is what that led to the hardfork.
During the process also known as the (hard fork), a proposal to increase the average block size in Bitcoin's block chain was rejected by the crypto currency's core development team.
Or the Bitcoin community, miners.