Automating a few Processes in my document

ok so i need help with a few things in google sheets. (this is for a game i play)

1.

i have an importfeed function that brings a whole row of information its desplayed like this:

" news:"<a href = \"http:\/\/www.torn.com\/profiles.php?XID=2224947\">Azicio501<\/a> deposited 1 x Cannabis"} "

in the first cell then it gives me a sort of time stamp next to it:

"  289693138:{"timestamp":1553669583  "

what im trying to do is connect that information to a graph in sheets. the problem i run into is because all the information is in one cell i can't make the document recognise if something gets used or deposited.

2.

with the time stamps i wanted to find a way where the document can update itself but know what cells are the new information.

any help would be appreciated, thank you in advance.

link to my document:

https://docs.google.com/spreadsheets/d/1Xa4XCeaQpEDdV7WYtJ6ayTjzFk24_mSNP6FOiySeFbA/edit?usp=sharing