Complex sentence: He found that the city defendants had in no ways used the tool of redistricting to alleviate racial segregation despite being aware of the possibility, and had in one case used redistricting to perpetuate racial segregation in schools.
Split into simpler sentences: He found that the city defendants had in no ways used the tool of redistricting to alleviate racial segregation despite being aware of the possibilit. It had, in one case, used redistricting to perpetuate racial segregation in schools.