LS都很不错——以下纯学术探讨
若考虑完整陈述句（单句）,可为
A restrains/suppresses/inhibits(3选1,下同) the integration/combination(2选1,下同) of B and C to reduce/decrease the generation/production of D.
若考虑为复句式（从句）,可考虑
A restrains/suppresses/inhibits the integration/combination of B and C,which could/may reduce/decrease the generation/production of D.
若为标题,则不宜完整句式
Integration/Combination of B and C Restrained/Suppressed/Inhibited by A to Reduce/Decrease the Generation/Production of D
任选,供参
