Complex sentence: The smaller "manualiter" settings of the catechism hymns and the four duets were added later in the remaining spaces, with the first five catechism hymns set as three-part fughettas and the last as a longer four-part fugue.
Split into simpler sentences: The smaller "manualiter" settings of the catechism hymns and the four duets were added later in the space remaining. The first five catechism hymns were set as three-part fughettas, while the last is a longer four-part fugue.