Usage patterns
〈事〉が煩雑になるfor something (a procedure, process) to become complicated
The procedures for this application are becoming more complicated every year.
煩雑な〈事〉a needlessly complicated matter or task
I get bogged down by cumbersome office work.
〈事〉を煩雑にするto make something (unnecessarily) complicated
This rule makes the procedure needlessly complicated.
煩雑さを解消するto eliminate the cumbersome complexity (of a process)
We introduced a system to eliminate the cumbersome complexity.