Complex sentence: If the reaction time (RT) of interlexical homographs is same to the controlled monolingual word, then it should be the evidence for language-selective access, otherwise the differences between them would support language-nonselective access.
Split into simpler sentences: If the reaction time (RT) of interlexical homographs is same to the controlled monolingual word, then it should be the evidence for language-selective access. Otherwise the differences between them would support language-nonselective access.