Complex sentence: The sites do resemble the national system in some ways, such as labor market conditions and JTPA project performance and the samples of individuals in the study were similar in age, work experience and ethnicity as those served nationally by the JTPA.
Split into simpler sentences: The sites do resemble the national system in some ways, such as labor market conditions and JTPA project performance. In addition, the samples of individuals in the study were similar regarding age, work experience and ethnicity to those served nationally by the JTPA.