Add punctuation: Thus if you have 3 computers you must buy 3 licenses
A: Thus, if you have 3 computers, you must buy 3 licenses.

Add punctuation: For a while it lurked in the shadows of more established publishing tools
A: For a while it 'lurked' in the shadows of more established publishing tools.

Add punctuation: Time and place June 6 9 am to 5 pm The Egg Bara 175 Brussels
A:
Time and place: June 6, 9 am to 5 pm, The Egg, Bara 175, Brussels.