Complex sentence: Magnetic tape has a nonlinear response at low signal strengths (see coercivity); bias increases the signal quality of most audio recordings significantly compared to unbiased recordings by pushing the signal into the linear zone of the tape's transfer function.
Split into simpler sentences: Magnetic tape has a nonlinear response at low signal strengths, as measured by its coercivity. Bias increases the signal quality of most audio recordings significantly by pushing the signal into the linear zone of the tape's transfer function.