Using a self-paced reading task, the study aimed to investigate (a) whether English learners in Taiwan immediately resolve main verb versus reduced relative clause ambiguities in a similar way as native English speakers and (b) whether the learners at various English proficiency levels show diverse profiles. With analyses and syntheses of reading times for critical segments, results showed that different proficiency groups of Taiwanese English learners resolved such ambiguities in a way similar to native speakers to varying extents. The findings suggest that the sentence-processing mechanism of human language is subject to sufficient facility with syntactic access and/or with a network of lexical, semantic, and pragmatic information of individual speakers.