occasion 意思是：“ 场合,时机)”.由它构成的词组 on occasion 有时,间或 .可见它是一个偏重于【时间】概念上的词；
people died from water pollution 是定语从句,定语从句中主、谓、宾齐全,先行词 occasions 只能在定语从句中作状语,所以用关系副词 when（= on which） ；
句意是：我了解到很多场合/时间,人们因水源污染而死亡.
I know of a number of occasions ____ people died from water
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