This implies first, that there are things, and then states that they fall apart.
In terms of it's relation to the content of the book, it highlights many things, the reasons they fall apart, and how they fall apart, in many intricate details.
In order to keep his high power position, Okonkwo tried his best to make everyone keep with the old ways of their society, because it was in the standards of those traditions that sustained his high position within the society.
In the land of his fathers where men were bold and warlike. This excerpt was a perfect example that showed Okonkwo’s drive for power.
He was often consumed in his actions of masculinity that seemed to know no limits.
Also, a crucial flaw was his inability to accept change in tradition.
Okonkwo's life falls apart, as does the life of traditional Nigerians.
Okonkwo’s self-destruction was caused by his drive for masculinity .
Okonkwo feared of becoming like his father, so he made his own path to life and how he dealt with problems in society.
By transitioning to his own way of masculinity he rejected everything that his father embodied; cowardice, gentleness, and laziness.