Tā de yǎnjiǎng chōngmǎn qǐfāxìng, ràng xuéshengmen shòuyì fěiqiǎn.
His lecture was full of enlightening insights, greatly benefiting the students.
Tips
grammar
启发性 is formed by adding the suffix 性 (-xìng, -ness, -ity) to 启发 (to inspire/enlighten). This pattern is common: 创造性 (creativity), 可行性 (feasibility), 积极性 (initiative).