Complex sentence: Canillas is now also an increasingly well-known centre for hill walking, routes having been developed in recent years mainly by Peter Strange and Phil Lawler, based on old out-of-use mule trails which have existed for centuries.
Split into simpler sentences: Canillas is now also an increasingly well-known centre for hill walking. Routes having been developed in recent years mainly by Peter Strange and Phil Lawler, based on old out-of-use mule trails which have existed for centuries.