QUES: Martinus introduces among other things new words and concepts

correct the punctuation.

CORRECTED: Martinus introduces, among other things, new words and concepts.

QUES: You may use it as is but must cite the corresponding reference see below

correct the punctuation.

CORRECTED: You may use it "as is" but must cite the corresponding reference (see below).

QUES: They were forbidden to participate in all cultural contexts

correct the punctuation.

CORRECTED:
They were forbidden to participate in all cultural contexts.