Add punctuation: Former SRA opered on dreamscape originally until he became an admin opus
A: Former SRA. opered on dreamscape.* originally until he became an admin (opus.*).

Add punctuation: The lumberjacks were paid with monthly checks and Seattle businesses charged a substantial fee ranging from ten to twenty percent to cash those checks Pennell would cash the checks for free
A: The lumberjacks were paid with monthly checks and Seattle businesses charged a substantial fee ranging from ten to twenty percent to cash those checks. Pennell would cash the checks for free.

Add punctuation: The images are for guidance purposes only as the distances between seats vary slightly from aircraft to aircraft
A:
The images are for guidance purposes only, as the distances between seats vary slightly from aircraft to aircraft.