it's just the language that forms when an initial anglo-saxon settlement gets pwned by romans thus introducing latin, then vikings who spoke a scandinavian tongue that resembled old english creating some sort of mingling and bastardising, and then normans came along speaking some sort of bastardised french, owing to the fact that the normans were vikings anyway, so that resulted in a second vector from which more latin crept into english. at least the way i understand the history of the language, which isn't very deep admittedly.