Complex sentence: Maintaining the railway through such rugged terrain is a major undertaking, both logistically and financially, and service is not always available for the full trip from Fort Bragg to Willits-however, there are shorter trips to halfway points running year-round.
Split into simpler sentences: Maintaining the railway through such rugged terrain is a major undertaking, both logistically and financially, and service is not always available for the full trip from Fort Bragg to Willits. However, there are shorter trips to halfway points running year-round.