Complex sentence: Given the increasing popularity of capillary testing, the WHO has recommended that a conversion factor between the two sample types be calculated, but to date no conversion factor has been issued by the WHO despite some medical professionals adopting their own.
Split into simpler sentences: Given the increasing popularity of capillary testing the WHO has recommended that a conversion factor between the two sample types be calculated. To date no conversion factor has been issued by the WHO despite some medical professionals adopting their own.