Complex sentence: However, there were two problems: a lack of water and, more significantly, a lack of transportation, for at this time a trip from Honolulu to the Ewa by horse-drawn wagon was an all-day affair.
Split into simpler sentences: However, there were two problems: a lack of water and, more significantly, a lack of transportation. A trip from Honolulu to the Ewa by horse-drawn wagon was an all-day affair.