a = [1,2,3,4,5,6,7,8,9,10]
b = [4,5,6]

# left sublist
[1,2,3]

# right sublist
[7,8,9,10]

filter(lambda x: x not in b, a)

list(set(a) - set(b))

a[:a.index(b[0])]

a[a.index(b[-1]) + 1:]

def array_split(arr, separator):
    result = [] # list of the sublists
    current_part = [] # current sublist we're assembling
    possible_separator = [] # store possible separator here (e.g. if the separator is 4,5,6 and we've got 4,5 so far)

    for i in arr:
        if i == separator[len(possible_separator)]: # matches next piece of separator?
            if len(possible_separator) == len(separator) - 1: # separator complete
                result.append(current_part)

                current_part = []
                possible_separator.clear()
            else: # add to possible separator
                possible_separator.append(i)
        else:
            current_part.extend(possible_separator) # wasn't the full separator, add to sublist and clear
            possible_separator.clear()

            current_part.append(i)

    result.append(current_part)
    return result

array_split([1,2,3,4,5,4,5,6,7,8,9,10], [4,5,6]) == [[1, 2, 3, 4, 5], [7, 8, 9, 10]]

str_a = ",".join(map(lambda x: str(x), a))   # str_a = '1,2,3,4,5,6,7,8,9,10'
str_b = ",".join(map(lambda x: str(x), b))   # str_b = '4,5,6'

str_left, str_right = str_a.split(str_b)     # str_left = '1,2,3,'
                                             # str_right = ',7,8,9,10'

left = list(map(lambda x: int(x), str_left[:-1].split(','))) # [:-1] is there to get rid of the trailing ,
right = list(map(lambda x: int(x), str_right[1:].split(','))) # [1:] is there to get rid of leading ,

def get_segment_index(base_list, sub_list):
    cursor, len_sub, len_base = 0, len(sub_list), len(base_list)
    for i in range(len_base-len_sub+1):
         if base_list[i:i+len_sub] == sub_list: # check for the match of sub-list
             yield cursor, i
             cursor = i+len_sub
    else:  # to yield the last segment
         if cursor != len_base:
             yield cursor, len_base

>>> a = [1,4,5,6,2,3, 9, 7,8,10,4,5,6,9,2]
>>> b = [4,5,6]

>>> [a[x:y] for x, y in get_segment_index(a, b)]
[[1], [2, 3, 9, 7, 8, 10], [9, 2]]

>>> a = ['I', 'am', 'sample', 'example', 'to', 'split', 'based', 'on', 'sample', 'example', 'sublist']
>>> b = ['sample', 'example']

>>> [a[x:y] for x, y in get_segment_index(a, b)]
[['I', 'am'], ['to', 'split', 'based', 'on'], ['sublist']]

>>> a = [1,2,3,4,5,6,7,8,9,10]
>>> b = [4,5,6]

>>> left, right = [a[x:y] for x, y in get_segment_index(a, b)]

# Left sublist
>>> left
[1, 2, 3]

# Right sublist
>>> right
[7, 8, 9, 10]