Complex sentence: In 1970, Blyth followed Kelsey to start in professional audio equipment manufacturing with Kelsey Morris, a company designing and making mixing consoles and loudspeakers for bands such as T. Rex, Ten Years After and King Crimson.
Split into simpler sentences: In 1970, Blyth formally joined Kelsey Morris to start in professional audio equipment manufacturing. He assisted in making mixing consoles and loudspeakers for bands such as T. Rex, Ten Years After and King Crimson.