Complex sentence: There was a period of a few years after John retired in 1994 that the band was directed by a few different directors then in 2001 Luke Aylsworth, John's son took over as director for the band, and the tradition in excellence was restored.
Split into simpler sentences: There was a period of a few years after John retired in 1994 that the band was directed by a few different directors. Then in 2001 Luke Aylsworth, John's son took over as director for the band, and the tradition in excellence was restored.