import re
rx = r"\(E\d+\)|([^\W\d]+(?:\s+[^\W\d]+)*)"
s = "Pork and beef, water, salt (1,7%), spices (white pepper, nutmeg, coriander, cardamom), stabilizer (E450), glucose, antioxidant (E316), a preservative (E250), flavorings"
res = [x for x in re.findall(rx, s) if x]
print(res)
aW1wb3J0IHJlCnJ4ID0gciJcKEVcZCtcKXwoW15cV1xkXSsoPzpccytbXlxXXGRdKykqKSIKcyA9ICJQb3JrIGFuZCBiZWVmLCB3YXRlciwgc2FsdCAoMSw3JSksIHNwaWNlcyAod2hpdGUgcGVwcGVyLCBudXRtZWcsIGNvcmlhbmRlciwgY2FyZGFtb20pLCBzdGFiaWxpemVyIChFNDUwKSwgZ2x1Y29zZSwgYW50aW94aWRhbnQgKEUzMTYpLCBhIHByZXNlcnZhdGl2ZSAoRTI1MCksIGZsYXZvcmluZ3MiCnJlcyA9IFt4IGZvciB4IGluIHJlLmZpbmRhbGwocngsIHMpIGlmIHhdCnByaW50KHJlcyk=
['Pork and beef', 'water', 'salt', 'spices', 'white pepper', 'nutmeg', 'coriander', 'cardamom', 'stabilizer', 'glucose', 'antioxidant', 'a preservative', 'flavorings']