Complex sentence: After trading Lalonde the Canadiens traded for Malone in 1923, but at age 33 his skills vanished, and he scored only a single goal that season while generally playing as a substitute.
Split into simpler sentences: After trading Lalonde, the Canadiens traded for Malone in 1923. But at age 33 his skills vanished, and he scored only a single goal that season while generally playing as a substitute.