Complex sentence: Jöntürk is considered one of the most underrated cult film makers of Turkish cinema from 1970s boom period due to his unorthodoxy of using psychedelic political and criminal themes and over-expressive dialogs in the movies he produced and written.
Split into simpler sentences: Jöntürk is considered one of the most under-rated cult film makers of 1070's Turkish cinema during its boom period. This is due to his unorthodoxy of using psychedelic yet political and criminal themes as well as over-expressive dialogs in movies he produced and written.