Complex sentence: The increasing rent coupled with a waning interest in the sedate sport of croquet was causing financial difficulties and in February 1875 the club decided to introduce lawn tennis at its grounds to capitalise on the upcoming interest in this new sport and generate additional revenue.
Split into simpler sentences: The increasing rent coupled with a waning interest in the sedate sport of croquet was causing the club financial difficulties. In February 1875 it decided to introduce lawn tennis at its grounds to capitalise on the upcoming interest in this new sport and generate additional revenue.