How do I remove certain lines inside a cell with a macro?

Hi, please view this cell from a server log (also attached to this post):

http://i.imgur.com/DEg9ZMO.gif

I need to delete the extraneous lines that start with "Subject:", "Security ID:" et al but leave other lines intact like "Object name:"

Also, I would like to copy certain lines to a new cell. "Object name:" and "Accesses:" should have their own column, obviously on the same row respective to the cell.

Can someone clue me in to what keywords I should google to assemble this macro?

thank you