I am mostly concerned about the meaning of
者. Its explanation is very blurry on YellowBridge, and there's no article on its usage in he Chinese grammar wiki.
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助人 = help people
助人者 = those who help people
人助= people's help
得人助 = get people's help
 he who; those who  a particle combining with some words to form adverbials
Some example terms with 者
死 = dead; 死者 = deceased (person)
長 = elder; 長者 = elderly (person)
偽善 = hypocritical; 偽善者 = hypocrite (person)
違抗規則 = defy the rule; 違抗規則者 = those who defy the rule (person)
Example for  a particle combining with some words to form adverbials-
兵者=(definition of) army;
凶器也 = is instrument of destruction
I would put 助人者得到人助 somewhere under bible quotes, probably Proverbs: 'He who giveth receiveth.'
Lots of examples for 者 here
电影爱好者 film freak
一群快艇爱好者 speedboat lovers
获奖者如下 and the winner/s is/are ..
助，帮助。help ,it can be verb or Noun.
得，得到。 obtain or get
This is the Chinese classical usage,
Translated into the form of modern Chinese ：
In english: If you often help some person,you can be helped by some person.