Complex sentence: Doolittle maintained an extensive practice in Middlebury, and was also a sought after legal instructor; among the attorneys who received their training in his office were Asa Aikens and William Slade.
Split into simpler sentences: Doolittle maintained an extensive practice in Middlebury, and was also a sought after legal instructor. Among the attorneys who received their training in his office were Asa Aikens and William Slade.