Final answer:
Brian Epstein's death led to The Beatles losing their managerial direction and the unity they once had, which they never fully regained.
Step-by-step explanation:
The Beatles, after the unexpected death of their manager, Brian Epstein, lost a sense of managerial direction and the organisational glue that held their business affairs together.
Epstein's death in 1967 left the band without the business acumen and personal support that had been crucial to their success. As a consequence, they faced difficulties and disagreements in business decisions that they had never encountered when Epstein was alive.
The band's cohesiveness and unity which had been a hallmark of their early success never fully returned after his death.