Complex sentence: Michael Sharwood Smith (b.1942) a researcher into the acquisition of non-native languages is a founding editor of a leading journal in the field, "Second Language Research", successor to the "Interlanguage Studies Bulletin".
Split into simpler sentences: Michael Sharwood Smith (b.1942) is a researcher into the acquisition of non-native languages. He is a founding editor of a leading journal in the field, "Second Language Research", successor to the "Interlanguage Studies Bulletin".