A kick, a melodic bassline (and a cool one at that), one modulated synth line following the same melody, a "riser" FX leading to the break. Vocal sample, then re kick bass melody. All in all, very few sounds (again, not saying that in a negative way) which leaves plenty of space in the audio spectrum to make all those parts sound absolutely, monstrously GOOD together.
Take modern goa and its "wall of sound" approach which fills the audio spectrum up to the fucking max and you're way more limited to make each part stand out, since there are so many of them mashed together.
(again, not saying one is "better" than the other, mind you)
Also: heavy layering / "wall of sound" shouldn't be mistaken for complexity, imho. It's simply another approach.
edit: this should be a topic of its own actually the thread got kinda derailed