Joining the two finite clauses ("We also need to remember that donations need not be strictly only in cash" and "they can also be in kind...") results in a run-on sentence (also called a comma splice). School students are generally taught that such sentences are "errors*", but they may in some contexts be acceptable.
Some readers of the quoted sentence will not notice the comma splice, others will notice it but not think it's a problem, and still others will react negatively. But this is not a matter of grammaticality. (The comma splice in the first sentence of this paragraph seems acceptable to me.)
That said, the second comma in your quoted text is problematic and its following non-finite clause being provided to a political party for its use) is poorly expressed. An improvement would be to remove that second comma and rewrite with an object complement as:
They can also be in kind such as making aircraft or helicopters booked
in the name of some company or individual available to a political
party for its use.
* "Avoid using run-on sentences." (Warriner's Middle School Handbook, p220)