Basically, Sorcerers are those without avatars (or unawakened ones) that can work some sorts of magic. This is because while Mages are rewriting reality so to speak, the Sorcerers are using mystic loopholes in the reality. So instead of one learning as their avatar grows stronger, that they can alter everything around them subconsciously, one would learn Alchemy based on treaties of Hermes Trismestigus/Cornelius Agrippa, or classical fortune-telling, among other things.
The thing is that some Changing Breeds can use Sorcery (Tengu, several Bastet Breeds, Uktena Garou), and its paradox-free; instead you have lots of difficulty modifiers, and nasty botches based on spells. Honestly, they work a bit like Attainments in Awakening, or magic in Second Sight.
When I use Sorcerer though, I make it a point to define "How" players have paths. For example, we have Fascination, which allows for social modifiers. So one may use Fascination as "Psychoanalysis" using Freudian Psychology as a focus to alter a person's will. Another person may use music as a focus, being a Bard in essence. Likewise, alchemy can mean "Potions and brews," or "Nuclear particle transmutation", and depending on how you define Alchemy, you use a different skill (Medicine vs. Science, as an example).