Trouble editing cell contents- Help is appreciated

Hello,
I am trying to delete the last line of several cells (5000 +) that are in one column. Below is the end of the text in one of the cells. All the cells end the same way , with a link to the Manufacturer. I would like to delete this last line of all the cells in the entire column. The last line is one whole Line, it is not splt into 2 lines like might appear here.

Is there a simple formula I could enter that would erase the last line, Because I am not very well educated in Code. If you know that your code will work please give me step by step instructions on how to do it. Your help is greatly appriciated.
Thanks
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POWER- Input : 100 ~ 240V AC universal
Output: 19V DC out
SIZE - 5.82"w x 2.79"h x 10.2"d WT.- 5.61 lbs.
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