The phrase "a significant factor however" is correct and usable in written English.
It can be used to introduce a contrasting point or to emphasize an important element in a discussion or argument.
Example: "While there are many variables to consider, a significant factor however is the impact of climate change on agricultural productivity."
Alternatives: "an important factor nonetheless" or "a crucial element, on the other hand".
Perhaps the most significant factor, however, was the rise of the dealer to whom, according to The Art Journal (1871), "have been owing the immense increase in the prices of modern pictures".
Results of this research suggest that the relational intensity and lack of structure at the camp posed challenges to team project work; however, a significant factor of the residents' learning may be attributable to these challenges and the resultant need to invent ways to manage them.
However, a significant factor in such environments is the intentions of the actors involved.
We support the finding that delay in treatment is a significant factor for development of osteonecrosis however open reduction of pediatric femoral neck fractures also seems to play an important role as found in our study.
Analysis of the overall cohort demonstrated that social deprivation was a significant factor for in-hospital mortality, however, this finding was not consistent between operative groups.
In the total group of CPT, metastasis was a significant factor in survival time (P=0.02), however, metastases were more frequent in CPC, and in subgroup analyses the numbers became too small for meaningful analysis.
However, a significant factor is that there remain a large number of variants in novel genes in the unsolved families that cannot be further validated at this time given the limited size of the current cohort and may represent rare and new causes of ataxia.
Both Mr. Remes and military officials largely agreed, however, that a significant factor in the recent unrest was the collapse of hopes that the United States government would at some point let them go.
Unlike the case of heterosexual risk factors, intimacy between the couple was however, not a significant factor.
Recent economic data has shown, however, that exports — a significant factor behind China's stellar growth — have fallen sharply.
