Complexity simplified?

Have any of you been through a process whereby you have worked on a strategy that became quite complex to implement because of say lots of indicators and/or signals; only to go on to simplify the strategy, to then make it complex again, to the point where it has morphed and changed and has gone through many iterations of change before finally settling on something that works?

If it worked then what did you do? Did you/are you still tweaking or do you leave alone and just trade?

Are your strategies in constant development or do you believe that you need to adjust for some reason?

Do you have systems that monitor your trades? Does this form part of the strategy? If part of the monitoring system failed, would the strategy fail or could you continue to trade?

Simplest works best for me - looking for say maximum 5 price characteristics to justify a trade. No indicators, but maybe 1 or 2 MA's. Only change 1 parameter ata a time, so you can check its impact when present/absent objectively.