Complex sentence: The two "false friends" may actually be related, having the same origin, unlike "false cognates", which are similar words in different languages that appear to have a common historical linguistic origin (whatever their current meaning) but actually do not.
Split into simpler sentences: The two "false friends" may actually be related, having the same origin. This is unlike "false cognates", which are similar words in different languages that appear to have a common historical linguistic origin (whatever their current meaning) but actually do not.