splitListAtSequence2.py

var2 = ['a','b','b','c','d','e', 'g', 'a', 'b','c', 'a','b','c','e']

def splitChar2(lst):
    temp = []
    for idx, x in enumerate(lst):
        try:
            if lst[idx + 1] != 'a':
                temp.append(x)
            else:
                temp.append(x) 
                yield temp
                temp = []
                splitChar2(lst[idx + 1:])
        except IndexError:
            temp.append(x)
            yield temp  

varw =[ x for x in splitChar2(var2)]
print (varw)