Shaykh Raslân has lessons on Tuhfah As-Saniyyah (a rather popular explanation of Al-Âjurûmiyyah).  The author is Muhammad Muhyî Ad-Dîn `Abd Al-Hamîd and his book is the best explanation of Al-Âjurûmiyyah I have yet seen.  But it isn’t the most basic, which is why you find that this explanation itself, has been ‘explained’.  The series is called Taysîr An-Nahw and can be accessed from the following link.  Again, the series is available in both audio and video formats, and is in Arabic.

Taysîr An-Nahw