Complex sentence: The games are notable for using their own language-- "Panzerese", consisting of a mixture of Ancient Greek, Latin and Russian language words as those languages were a hobby of Yukio Futatsugi, one of the core designers of the first game.
Split into simpler sentences: The games are notable for using their own language-- "Panzerese", consisting of a mixture of Ancient Greek, Latin and Russian language. Words in these languages were a hobby of Yukio Futatsugi, one of the core designers of the first game.