Complex sentence: The formation of this hetrodimeric complex occurs best at tempatures around 37 degrees celius, but when tempeatures are below this number the formation of the heterdimeric complex is reduced significantly.
Split into simpler sentences: The formation of this hetrodimeric complex occurs best at tempatures around 37 degrees celius. An important thing to note is that when tempatures get below 37 degrees celius the formation of this heterodimeric complex is reduced significantly.