Complex sentence: Typically several tentacles use the same pit, suggesting that they may be appendages of a larger organism, indeed in HL1 After the first tentacle encounter, the player travels through the chasm the creature had occupied.
Split into simpler sentences: Typically several tentacles use the same pit, suggesting that they may be appendages of a larger organism. Indeed in "Half-Life", after the first tentacle encounter, the player travels through the chasm the creature had occupied.