Complex sentence: The first person to distinguish the two types of "l" in Polish was Jakub Pakoszowic who in 1440 proposed a letter resembling\\\\ ell to represent light L. For dark L he suggested l with a stroke running in the opposite direction as the modern version.
Split into simpler sentences: The first person to distinguish the two types of "l" in Polish was Jakub Pakoszowic who in 1440 proposed a letter resembling\\\\ ell to represent "l". For "ł" he suggested "l" with a stroke running in the opposite direction as the modern version.