Complex sentence: Tenjin Shinyo-ryu was developed after the period of civil war in Japan, thus without armor the movements emphasized were faster and more strikes were incorporated, primarily aimed at human vital points and meridians which were exposed due to the lack of armor.
Split into simpler sentences: Tenjin Shinyo-ryu was developed after the period of civil war in Japan; thus, without armor, the movements emphasized were faster and more strikes were incorporated. The strikes were also primarily aimed at human vital points and meridians, which were exposed due to the lack of armor.