Complex sentence: Steck set his first speed record on the North Face of the Eiger in 2007, climbing it in 3 hours and 54 minutes, the record was lowered by Steck himself to 2 hours 47 minutes 33 seconds the following year.
Split into simpler sentences: Steck set his first speed record on the North Face of the Eiger in 2007, climbing it in 3 hours and 54 minutes. The record was lowered by Steck himself to 2 hours 47 minutes 33 seconds the following year.