Complex sentence: Holloway continued to sit in with Gillespie well into the eighties and on June 6,1987, performed with a large group of musicians honoring Gillespie at Wolf Trap National Park for the Performing Arts.
Split into simpler sentences: Holloway continued to sit in with Gillespie well into the 1980s. On June 6,1987, he performed with a large group of musicians honoring Gillespie at Wolf Trap National Park for the Performing Arts.