Complex sentence: After Roy Park died in 1993, the future of the group was put into doubt as his estate sold much of the group to corporate investor Gary Knapp who in turn sold the remnants of the Park group to Media General in 1996.
Split into simpler sentences: After Roy Park died in 1993, the future of the group was put into doubt as his estate sold much of the group to corporate investor Gary Knapp. In turn, he sold the remnants of the Park group to Media General in 1996.