Complex sentence: In his first year he was noted as attending the Lords without missing a session until the years 1735 to 1739, when he was noted for his non attendance, then after 1742 again attended without fail.
Split into simpler sentences: In his first year he attended the Lords without missing a session. In the years 1735 to 1739, he was noted for his non attendance, then after 1742 again attended without fail.