The phrase "also an important function" is correct and usable in written English.
You can use it to emphasize that something serves a significant role in addition to other functions being discussed.
Example: "In addition to its primary purpose, the software has also an important function in data analysis."
Alternatives: "additionally a key role" or "also a significant function".
Quality control of the completed work is also an important function.
Flexible strain-gauge sensors are an essential component in electronic devices, and pressure sensing is also an important function.
But keeping cadres in line politically is also an important function of the party's discipline-inspection committees, which are responsible for shuanggui investigations.
Gamma-aminobutyric acid (GABA) is a major inhibitory neurotransmitter of the brain, but has also an important function in the inhibition of glucagon secretion in the pancreatic alpha-cells.
The nonsense-mediated RNA decay (NMD) machinery, which is best known for its role in the degradation of mRNAs containing pre-mature termination codons, has also an important function in the displacement of TERRA from human telomeres (Azzalin et al, 2007; Chawla and Azzalin, 2008).
Paper printouts also serve an important function, he said.
In gas diffusion electrodes (GDEs) with in-situ grown aligned Pt nanowire (NW) catalysts, the GDL can also provide an important function in controlling the growth and distribution of the Pt nanowires.
Nitrogen, one of the limiting nutrients for the yield of crops, also has an important function in methane oxidation of rice rhizosphere microbial community (Shrestha et al. 2010).
Imaginative space also serves an important function within the poem.
Growth hormone (GH) is primarily involved in stimulating skeletal and visceral growth, but also has an important function in protein, lipid and carbohydrate metabolism.
Eps15 specifically contributes to the severing of clathrin-coated vesicles, but also performs an important function in coupling ubiquitinated cargo to clathrin-independent internalization [41].
