Complex sentence: In 1588 Castle Sinclair Girnigoe withstood a siege by the Earl of Sutherland and in 1590 George Sinclair, 5th Earl of Caithness, invaded Sutherland resulting in the Battle of Clynetradwell.
Split into simpler sentences: In 1588 Castle Sinclair Girnigoe withstood a siege by the Earl of Sutherland. In 1590, George Sinclair, 5th Earl of Caithness, invaded Sutherland resulting in the Battle of Clynetradwell.