The phrase "appears complicated" is correct and usable in written English.
You can use it when describing something that seems difficult to understand or intricate at first glance.
Example: "The instructions for assembling the furniture appear complicated, but they are actually quite straightforward once you start."
Alternatives: "seems complex" or "looks intricate".
The independence of resistin in disease prediction and diagnosis appears complicated by its confounders, such as C-reactive protein.
Although (21) appears complicated, it is in closed form since higher order derivatives of arbitrary order are known for the generalized hypergeometric function pFq ap);(bq);z [23].
Thus, the contribution made by EcO157 sequestered in the sediment to the dynamics of stream contamination appears complicated by a variety of factors, some specific to the region being studied.
The design of modern multicomponent alloys (MCAs) appears complicated, which usually entails mixing multiple elements that have a variety of sizes and heat of mixing.
Teaching methods play an important role in music education which can appear complicated and abstract to the child.
With a profusion of details concerning producers, geography, vineyard and vineyard rating, the Burgundy label, too, can appear complicated and intimidating.
It has been shown that, although time results may appear complicated, the arrival of various pulses at the receivers can be understood in terms of the travelling body pulses and guided waves.
A previous report showed that fractured UBCs frequently appear complicated on MR imaging, with heterogeneous fluid signals and regions of nodular and thick peripheral enhancement related to pathologic fracture and early healing [ 17].
Relatedly, ranking algorithms can appear complicated and opaque to the searcher: it can be difficult for a user to determine or understand why the system has chosen to return documents in a particular order, especially in the presence of expansion or explosion.
Be careful when adding both, however as it can appear complicated.
The Republican race appears more complicated still.
