Complex sentence: When Aaron suddenly starts playing hard to get with Holly, Adam questions it, but Aaron says its all part of the plan, but everything slots into place when the boys and Holly go on a "lads" night out.
Split into simpler sentences: When Aaron suddenly starts playing hard to get with Holly, Adam questions it but Aaron says its all part of the plan. However, everything slots into place when the boys and Holly go on a "lads" night out.