s = ' playsound3Dwhenpossible(soundspotpoint18, %$videos_sounds_path%/sounds/lavazza_-_auguri_cherubini__15_.mp3, true, false, -52.644483, 0.947368, 90, 1, spotpoint18);'
x = s.split("(")
print(x)

x = s.split("?=(")

def split_keep_separator(source, sep):
    elements = source.split(sep)
    return [e for t in zip(elements, [sep] * (len(elements))) for e in t][:-1]

s = ' playsound3Dwhenpossible(soundspotpoint18, %$videos_sounds_path%/sounds/lavazza_-_auguri_cherubini__15_.mp3, true, false, -52.644483, 0.947368, 90, 1, spotpoint18);'

x = split_keep_separator(s, "(")
print(x)

# [' playsound3Dwhenpossible',
#  '(',
#  'soundspotpoint18, %$videos_sounds_path%/sounds/lavazza_-_auguri_cherubini__15_.mp3, true, false, -52.644483, 0.947368, 90, 1, spotpoint18);']

import re
s = ' playsound3Dwhenpossible(soundspotpoint18, %$videos_sounds_path%/sounds/lavazza_-_auguri_cherubini__15_.mp3, true, false, -52.644483, 0.947368, 90, 1, spotpoint18);'
x = re.split(r'(()', s)