sure can... field calculator expression using python parser.
Now... how do you want the output formatted?
remove the duplicates?
sort the output?
# ---- split on splitter, remove duplicates and rejoin in sorted order
def split_o_rama(a, splitter="/"):
"""split stuff, keeping first"""
out = []
sp = a.split(splitter)
for i in sp:
if i not in out:
out.append(i)
return splitter.join([i for i in sorted(out)])
# ---- sample data and run
a = "e/a/b/c/a/d/a/b"
split_o_rama(a)
'a/b/c/d/e'
... sort of retired...