Complex sentence: Most models have 60 keys and a keyboard range of F1 to E6 (fundamental frequencies of 43.6Hz--1318.5 Hz), a five octave range that covers the range of an electric guitar and most of the range of a 4 string electric bass guitar.
Split into simpler sentences: Most models have 60 keys and a keyboard range of F1 to E6 (fundamental frequencies of 43.6Hz--1318.5 Hz). This five octave span covers the range of an electric guitar and most of the range of a 4 string electric bass guitar.