Complex sentence: Large-scale development of Kowloon began in the early 20th century, with the construction of the Kowloon-Canton Railway and the Kowloon Wharf; but due to Kowloon's close proximity to Kai Tak Airport, building constructions are limited by flight paths.
Split into simpler sentences: Large-scale development of Kowloon began in the early 20th century, with the construction of the Kowloon-Canton Railway and the Kowloon Wharf. Due to Kowloon's close proximity to Kai Tak Airport, building constructions were limited by flight paths.