Complex sentence: When alcohol is present in the brain, it binds to GABA receptors and making them more inhibitory and they also bind to glutamate receptors to block their excitatory activity, which affects the brain from making memories, making well thought out decisions, and controlling impulses.
Split into simpler sentences: When alcohol is present in the brain, it binds to GABA receptors. This inhibition affects the brain from making memories, making well thought out decisions, and controlling impulses.