3D Brawler was so annoying until I sat with it, it just takes patience.
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Sephiroth's 1st Combo is...

Right Stick Up - Left Stick Left - Right Stick Right - Left Stick Up - Right Stick Down

Now the second combo is not always the same, so you need quick reflexes. He'll either go...

Sephiroth's 2nd Combo is...

Left Stick Down - Right Stick Right - Left Stick Up

But depending on "RNG" he may go after you with this aggressive combo instead...

Sephiroth's 3rd Combo is...

Left Stick Left - Left Stick Left - Right Stick Up - Left Stick Down

When he's about to lose this is the one he'll go for...

Sephiroth's 4th Combo is...

Right Stick Up - Left Stick Left - Right Stick Right - Left Stick Up - Left Stick Up - Left Stick Down