Complex sentence: They created an aggressive-yet all-around edgy-sound that was their signature, and in' 81 they put out a 7-song demo tape they called "Distortion" which became popular, especially with DJs and Critics alike.
Split into simpler sentences: They created an aggressive-yet all-around edgy-sound that was their signature. Soon the guys were developing their own sound, and in' 81 they got together and put out a 7-song demo tape they called "Distortion" which became popular, especially with DJs and Critics alike.