Imo would it be easier to understand, if this combo is notated that way I wrote it down below. And after the first 5C I would use another 5C instead of the 2C. It was not possible for me to connect a 214A after 2C, but after 5C (I suppose it`s depending on the char you`re playing against, I used Tsubaki and Ragna as dummies). This one is a difficult one, maybe only for me or I must simply get used to it. But atm I hate the 66>5B>whatever combos. Oh, and after 5B is the hjc or sjc not necessary, a simple jc is enough.
5C>623A+A>jc>f.j.2C>5C>5C>214A>66>5B>jc>j.A>j.B>jc>j.2A>j.C dmg:4276
Btw, instead of 66 using a command dash (623A) makes it easier to perform this combo, at least for me;)