The phrase "a more complex cause" is correct and usable in written English.
It can be used when discussing reasons or factors that contribute to a situation or phenomenon, indicating that the cause is not simple and involves multiple elements.
Example: "The increase in pollution levels can be attributed to a more complex cause, including industrial emissions and urban development."
Alternatives: "a more intricate reason" or "a more complicated factor".
Recent attention, however, has focused on several abnormalities, which together suggest a more complex cause.
Examples may include the annotation of the Binding event through the linkage of a substrate term (e.g., malate) with a protein term (e.g., Mdh) or the annotation of a more complex Cause event through the linkage of the stress term (e.g., chromate shock) with the Up-regulation and Down-regulation events, which are, in-turn, linked with the proper gene-related terms (e.g., SO_2426 and omcB).
However, because of these complexities, caution should be exercised, as an apparent dysfunction in substrate oxidation might have more complex causes than expected.
When PTSD results from a single event, typically 8 to 12 weekly sessions are indicated; for more complex causes (for example, chronic disability and multiple events), many more sessions may be required.
More complex causes include seborrheic dermatitis (oily skin not caused by a lack of shampoo), psoriasis, eczema, contact dermatitis, and a fungus known as malassezia.[8].
The aim of this study was to investigate if this association prevails despite the more complex causes of bone loss in RTR.
STAMP extends current accident causality to include more complex causes than simply component failures and chains of failure events or deviations from operational expectations.
America's rising income inequality (which has far more complex causes than the tax system) means that the richest Americans have been getting relatively richer and hence should be paying more in taxes, quite independently of tax cuts.
CANCUN, Mexico, 17 August 2004 – UNICEF Executive Director Carol Bellamy told leading pediatricians gathered here this week that they are crucial to efforts to improve child survival, saying that they must advocate for action that goes beyond traditional health initiatives to address the more complex causes underlying entrenched child mortality.
The reverse situation, where disease is transmitted from wild reservoirs to domestic animals, can also occur, although it is in many cases controversial as politicians and other vested interests find it simpler to blame wildlife species rather than addressing more complex causes of epizootics that require changes in farming practices.
Although estimating these two models takes almost the same time using the GLM procedure in SAS®/STAT [21]: it takes 0.134 second to estimate the benchmark model 1 for one zone and one test year (i.e. one regression model) and takes 0.146 second to estimate the proposed model 2 for the same zone and year, but a more complex model may cause an overfitting issue as commented below.
