Here is the original item:
Because of all his responsibilities at work and
school,
(A) Michael
had no time to devote to the yard,
(B) so weeds,
vines, and insects thrived in this
jungle. (C) That
neighbors looked on with disapproval.
You wanted to do this:
Because of all his responsibilities at work and school,
Michael had no time to devote to the yard so
weeds, vines, and insects thrived in this jungle. That neighbors looked
on with disapproval.
Removing the comma after yard not only is wrong but also neglects to fix the fragment that exists in the item. Reconsider your options!
You might want to review the rules.