Complex sentence: Therefore the choice of which joseki (of many) to play in any given situation should be based on an assessment of the global position, including considerations of direction of play, current balance of territory and influence, and one's own game strategy.
Split into simpler sentences: Therefore the choice of which joseki (of many possible) to play in any given situation should be based on an assessment of the global position. This include considerations of direction of play, current balance of territory and influence, and one's own game strategy.