This year, as in previous years, tickets sold very quickly.
As with his earlier movies, the special effects in his latest film are brilliant.
Based on the dictionary,"as" is used as a conjunction here.Why as can be put in front of "in" or "with"? Should't a conjunction be put in front of a clause? Please teach me,thank you very much.
Try looking at it this way:
1. Tickets sold very quickly this year as [they did] in previous years.
2. The special effects in his latest film are brilliant as [they are] with his earlier movies.